US S21 5G not registering on any mobile networks? - Samsung Galaxy S21 Questions

Hi,
I'm in South Africa and I bought a SM-G991U1 (US unlocked version) on Amazon Renewed and everything works fine except for mobile connectivity.
I get the "Your phone's not registered on a network" message if I try to make a call and mobile data does not work.
I've tried:
- Resetting network settings
- Manually setting APN details
- Tried a few other SIMs from different carriers as well that work in other phones
- Checked IMEI info, doesn't seem corrupted or 'null'
I suspect that the modem firmware or something else is region specific to the US on this model and not working on South African networks as the phone does support our network bands according to GSMarena.
Would it be possible to re-flash the modem firmware or fix the issue some other way?

Hello I'm having the same problem, have you find any info about it?

Not much, I went to a carrier store and the phone seemed to work alright there after rebooting the phone with the sim card installed. I am starting to suspect that the phone doesn't like my closest cell tower maybe? Or possibly doesn't like using another carrier's mobile tower?
No idea.
I've since bought an identical but South African version of the same S21 which works flawlessly.
As a quick rant for anyone considering buying from Amazon: I tried to return the phone, shipping it back to the US and everything, only for Amazon to refuse to pay the import duties on it once it arrived, forcing DHL send it right back and charging me for it again

Related

[Q] GT-I9300 S3 use in USA

Hello, I recently visited the USA (Las Vegas) and discovered that my UK bought (UNLOCKED) Samsung Galaxy S3 could not make nor receive calls in the USA. Roaming WAS enabled and I had an R symbol over the signal strength indicator. I have a Vodafone pay as you go sim card which I have used (as my main sim) over numerous years now. I have used it in other phones previously (HTC, Samsung, LG, etc.) over the years and they have all made and received calls in the USA (roaming) no problem. I did get a text message (eventually) when I was in the USA saying welcome to USA and calls cost £1.50, etc, etc. Yet when I tried making a call, I had an automated voice message asking me to contact my operator for some reason (can't remember the specifics). I've never had a problem using my Vodafone sim roaming in the USA and with previous phones, always made and received calls without any hassle (i.e. found a network automatically, e.g. AT&T, T-Mobile, etc.). Also, I visited Las Vegas last year with the same sim card but a different phone (HTC Desire HD) and was able to make and receive calls. I recall my brother saying that he had read something on the internet about the UK spec. S3 having hardware differences with the rest of the world versions, including not being able to work in the USA for calls. However, he could not find the site again. Has anybody else had this problem or know about it?
Yee1 said:
Hello, I recently visited the USA (Las Vegas) and discovered that my UK bought (UNLOCKED) Samsung Galaxy S3 could not make nor receive calls in the USA. Roaming WAS enabled and I had an R symbol over the signal strength indicator. I have a Vodafone pay as you go sim card which I have used (as my main sim) over numerous years now. I have used it in other phones previously (HTC, Samsung, LG, etc.) over the years and they have all made and received calls in the USA (roaming) no problem. I did get a text message (eventually) when I was in the USA saying welcome to USA and calls cost £1.50, etc, etc. Yet when I tried making a call, I had an automated voice message asking me to contact my operator for some reason (can't remember the specifics). I've never had a problem using my Vodafone sim roaming in the USA and with previous phones, always made and received calls without any hassle (i.e. found a network automatically, e.g. AT&T, T-Mobile, etc.). Also, I visited Las Vegas last year with the same sim card but a different phone (HTC Desire HD) and was able to make and receive calls. I recall my brother saying that he had read something on the internet about the UK spec. S3 having hardware differences with the rest of the world versions, including not being able to work in the USA for calls. However, he could not find the site again. Has anybody else had this problem or know about it?
Click to expand...
Click to collapse
I have no idea about roaming in the USA...
However, I do know that the phone works on AT&Ts network, because I live in the USA & use the I9300 on AT&Ts network. The I9300 will not work on T-Mobile's data network, but should work on T-Mo's voice network.
That probably wasn't much help to you. I just wanted to confirm for you that the phone does work on AT&Ts network here.
brkshr said:
I have no idea about roaming in the USA...
However, I do know that the phone works on AT&Ts network, because I live in the USA & use the I9300 on AT&Ts network. The I9300 will not work on T-Mobile's data network, but should work on T-Mo's voice network.
That probably wasn't much help to you. I just wanted to confirm for you that the phone does work on AT&Ts network here.
Click to expand...
Click to collapse
Thanks brkshr, that was helpful. Good to know that a GT-I9300 does work in the USA.
I thought the USA had different models (SGH-T999 and SGH-I747). What made you decide to get a GT-I9300?
I may try again (next time I go back to USA) and if still the same, will try an AT&T sim. I must admit, I don't know anything about the different networks in the USA. Can I get a pay as you go sim for free? In England, you can get sim cards for different networks free and then obviously pay to top up.
Yee1 said:
Thanks brkshr, that was helpful. Good to know that a GT-I9300 does work in the USA.
I thought the USA had different models (SGH-T999 and SGH-I747). What made you decide to get a GT-I9300?
I may try again (next time I go back to USA) and if still the same, will try an AT&T sim. I must admit, I don't know anything about the different networks in the USA. Can I get a pay as you go sim for free? In England, you can get sim cards for different networks free and then obviously pay to top up.
Click to expand...
Click to collapse
You are correct. The U.S. does have it's own variations. I decided to buy the I9300 for the quad-core & I was hoping that Samsung would be more likely to release sources for it & update it faster. They do update the I9300 faster, but I prefer AOSP (Google's stock Android) over Samsungs TouchWiz & that's where sources come in to play. So now I wish I would have gone with a U.S. variant, because sources for the US variant are released. Oh well! (Sorry for the rant)
Unfortunately, we don't get free SIM cards here. The best thing to do is buy an AT&T SIM card online ahead of time. Then activate it on a prepaid plan when you get here. You need a Micro SIM card. They should cost anywhere from $5 to $15. Otherwise, you have to go into an AT&T store & buy their 'SIM Starter Kit' for $25... Complete BS.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias=aps&field-keywords=at&t+sim+card
Thanks again, the link (to Amazon) is very useful. I think I will get an AT&T pre-paid sim card as suggested. At least that way I can use mobile data (when wi-fi is not available) and not have to pay extortionate data roaming charges. Especially useful for mobile data assisted GPS.
One last question though. In the UK, you can keep your number even if you don't top up for ages. In the US, can you buy a pre-paid sim card, use it once, not top up for say a year and still be able to use the sim again, i.e. it won't be deactivated will it? That way I can have it as a holiday sim (I visit the US every year).
Yee1 said:
Thanks again, the link (to Amazon) is very useful. I think I will get an AT&T pre-paid sim card as suggested. At least that way I can use mobile data (when wi-fi is not available) and not have to pay extortionate data roaming charges. Especially useful for mobile data assisted GPS.
One last question though. In the UK, you can keep your number even if you don't top up for ages. In the US, can you buy a pre-paid sim card, use it once, not top up for say a year and still be able to use the sim again, i.e. it won't be deactivated will it? That way I can have it as a holiday sim (I visit the US every year).
Click to expand...
Click to collapse
I don't know the answer to that question. Sorry.
Sent from my GT-I9300 using Tapatalk 2
Question!!
I bought an unlocked i9300 the quad core international galaxy s3.. i'm using Simple Mobile micro simcard.. i wanted to use AT&T prepaid simcard the one amazon sell.. i 'm asking if anyone used the AT&T with this phone and make it work.. i went to AT&T store and they told me the simcard will never work on my phone so don't buy it..i live in Texas USA.
PS: i'm sorry if this question been asked before and thank you all for your time and help
Have you seen this thread?
http://forum.xda-developers.com/showthread.php?t=1696025
Sent from my Nexus 7 using XDA Premium HD app

Hyundai MultiCav Q5L+ Smartphone - Doesn't work in India

Hello,
I bought this phone in Malaysia @ Lowyat PLaza.. Paid RM1099.. The Hyundai Multicav Q5L+ has good features & worked Ok in MY using the MY SIMs but when I moved to India (Chennai) it stopped working. When I put my India SIM (Vodafone) and the MY SIM - Tunetalk (it's a dual SIM phone) neither of the network signals seems to pick up. Note, the phone does display that its a Vodafone SIM, Tunetalk SIM etc. but no signal and there is a "cross" displayed next to the signal bar. I tried selecting the network manually but that didn't help. When I contacted the MY vendor (who sold me the phone) he said something about the IMEI range registered on the phone being different than the one in India and hence the phone needs to be patched. Apparently it can be done by some of the service center shops locally. When I went to a few of them, they took a look and couldn't figure out how to fix it for this brand of phone. Note, both the SIMs (incld the MY one which is on roaming) work perfectly well with my old phone which I had purchased in India. So nothing wrong with the SIM cards or the networks in general but something to do with this phone. Any help will be appreciated.

Blackview BV7000 Pro fails to register to cell network

Hi, I have been looking everywhere for answers and hopefully some one here can give me one.
I researched rugged phones and decided on the BV7000 Pro because it supports LTE Bands 1/3/7/8/20
My cell provider - Virgin Mobile Canada stated they run on LTE Bands 2/3/4/7
So my phone should work on Bands 3/7
When the phone searches for networks, it is able to display Virgin 4G, Telus 4G, EXT 2G, EXT 4G
When I try to connect to Virgin 4G, it tries then states it failed to register to the network and to try again later
I have confirmed my SIM card and APN settings with Virgin and the SIM card works in my old Motorola Razr but on 3G. The BV7000 doesn't work on the 3G bands Virgin uses so I can't try connecting using 3G.
So I want to know what you think is the reason why my phone can't register to Virgin Mobile Canada's Network?
Other BV7000 Users in Canada, United States and Mexico have reported the same problem.
I have contacted Blackview support and they eventually stated it won't work in Canada but provided no reason why. They posted this 11 days after I had purchased the phone and it was in the middle of being sent to me. However I suspect their support isn't the brightest based on some of the responses I have seen on their forum. The BV6000 works in Canada and the US.
I don't know anything about how the phone communicates to the provider exactly but to me it seems like there is a failure in communication in terms of security which is preventing it from connecting.
Hopefully some one can shed some light on this and maybe find a way around it so I can get this thing to work as a phone.
bv7000 pro, fails on mexico
hello, i have the same problem, live in mexico, it doesnt support 4g, If i have luck it will be 3g data, but i never seen that, only edge, i have i cool phone, but It is useless on internet data.
On the blackview forum theres no help there, Only users complaining about the same in North America
Niagua said:
hello, i have the same problem, live in mexico, it doesn't support 4g, If i have luck it will be 3g data, but i never seen that, only edge, i have i cool phone, but It is useless on internet data.
On the blackview forum theres no help there, Only users complaining about the same in North America
Click to expand...
Click to collapse
Hi, I unfortunately haven't found a solution yet. I have attempted to request a return through the AliExpress website and the seller has completely ignored me. I had to contact AliExpress customer support to have my return request escalated. The seller finally contacted me today asking if I had received the phone. Which is a stupid question because there clearly is communication between use showing I received the phone and have had problems with it.
Your only option is to try to return it or find a phone provider there that it will work on so you can try to sell it to some one on that network or switch to that provider. I found a provider in Canada called 'Rogers' that it works on but I can't switch to them because I would loose my old plan that is cheaper than the modern equivalent.
Either that or learn how to hack the phone to get to the modem that technically can operate on all bands, they just have to be enabled. Blackview uses the MediaTek CPU. I am desperate to try but I am pretty sure I would kill the phone.
sooo...... do you kill the phone??.. hahaha
Is a bad phone, i try with another company in mexico (telcel), but it lost a lot the signal, when you have to make a call, surprise you can't.
asking on the facebook pago of blackview, they say is a hardware problem, so, there is no solution, only keep waiting for bv8000 (if you want to try again)
Niagua said:
sooo...... do you kill the phone??.. hahaha
Is a bad phone, i try with another company in mexico (telcel), but it lost a lot the signal, when you have to make a call, surprise you can't.
asking on the facebook pago of blackview, they say is a hardware problem, so, there is no solution, only keep waiting for bv8000 (if you want to try again)
Click to expand...
Click to collapse
Still waiting for either the aliexpress customer care to figure it out or the seller to reply to me. I haven't done anything with the phone yet. I have been trying to sell it locally but only one person was interested.
When you say they said there is a hardware problem, do you mean the phone is defective or the hardware just isn't configured to work with North American networks but works fine in Asia?
Capskyfox said:
Still waiting for either the aliexpress customer care to figure it out or the seller to reply to me. I haven't done anything with the phone yet. I have been trying to sell it locally but only one person was interested.
When you say they said there is a hardware problem, do you mean the phone is defective or the hardware just isn't configured to work with North American networks but works fine in Asia?
Click to expand...
Click to collapse
i understand that..... is work fine in asia but not in north america.
i'm in contact whit my seller, they try to help me with 3 problems,
- Does not detect my company's signal
- Only works with edge (doesn't support 3g or 4g)
- after make or receive a call, i can't do another one, have to reboot the device.
If they find a solution i will let you know on this forum
Niagua said:
i understand that..... is work fine in asia but not in north america.
i'm in contact whit my seller, they try to help me with 3 problems,
- Does not detect my company's signal
- Only works with edge (doesn't support 3g or 4g)
- after make or receive a call, i can't do another one, have to reboot the device.
If they find a solution i will let you know on this forum
Click to expand...
Click to collapse
Hi, I was just wondering what website you bought your phone through? I bought mine through the AliExpress website, through the Desoon Technology Co., Limited store. The seller has ignored my repeated requests for a return for refund and AliExpress Customer Service won't even talk to me anymore. Nice place to run a shady store when the host website can't even enforce their own rules.
i bought on ebay, honesty i thought i will find a solution for the problem #3 (reboot after a call), but nope, blackview forum is very slow on don't give any solution.
for the problema 1 and 2.... there is no solution, the phone doesn't support 3g whit most of the companys in America (canada, us, mexico or south america), is hardware problem., this problem is fixed on the new bv8000 pro, is has more frequency bands to support global network.
It does not work 3G or 4G only 2G.
I have a blackView bv7000 pro, but it does not detect the networks of 3G or 4G only 2G, here works well only the phone with 2 SIM, the wathapp works well only the internet is very slow, in one word is not good for the internet, it is fast with the applications, but with the internet nothing else is not good.
This in Mexico with any telephone service here.

AU Carrier Samsung S9+ Phone Japan

AU Carrier Samsung S9+ Phone Japan
Have anyone encounter the same issue?
I bought a second hand Samsung S9+ from Japan with AU network carrier. But before i bought it, I asked the owner to request from the network to unlock it. And they did, so now I can use it to any network. I went back to my country Philippines, I use the the simcard there, I can use it for call or text, I can receive and send messages. But I can't connect to mobile data. But I can access the FREE DATA on my network. So, I really dont understand what is the problem. When i'm still in Japan, I've tried using mobile data using other sim card in Japan, its working well (so no problem with that) I've already tried playing with the network settings. Still none. Wifi is OK.
I hope someone out there can help me.

Question Sony Xperia 1 iii xq-bc62 5G not working. Flash xq-bc52?

Hi, i bought a unlocked xq-bc62 in US. I travel a lot and discovered 5G won't work in several carriers networks, no matter what I do in the phone ( I spend more time outside US). I called the carriers support and they confirmed their network doesn't have any lock preventing the use of overseas 5G bought phones. So far, I tried to use it in Portugal, UK, Ireland and Brazil but 5G is not recognized by the phone. I changed the sim for a 5G local one, changed ASN, manually chose network (5G ones are not displayed) and no success. I even tried to pray, but again, no success. I contacted Sony Support and they said phone will only work in 5G in 2 of the 3 main carriers in US and not outside US, despite the phone tech specs says it will work in all the frequencys used by above carriers. There are some threads here that confirm xq-bc62 Is not a full 5g phone. All said and done, my Question: is it possible to flash another region Image like xq-bc52 or xq-bc72 in this hardware? Will it work fine and, mainly, will 5G networks be accessible outside US? Tks
Some times its hardware but you can try mtk engineer mode settings there may be something of use there
If you can get the original vendor file usually have (user low ship...) its usually international
Unless the phone is using 4.5G and not real 5G
marcofgn2 said:
Hi, i bought a unlocked xq-bc62 in US. I travel a lot and discovered 5G won't work in several carriers networks, no matter what I do in the phone ( I spend more time outside US). I called the carriers support and they confirmed their network doesn't have any lock preventing the use of overseas 5G bought phones. So far, I tried to use it in Portugal, UK, Ireland and Brazil but 5G is not recognized by the phone. I changed the sim for a 5G local one, changed ASN, manually chose network (5G ones are not displayed) and no success. I even tried to pray, but again, no success. I contacted Sony Support and they said phone will only work in 5G in 2 of the 3 main carriers in US and not outside US, despite the phone tech specs says it will work in all the frequencys used by above carriers. There are some threads here that confirm xq-bc62 Is not a full 5g phone. All said and done, my Question: is it possible to flash another region Image like xq-bc52 or xq-bc72 in this hardware? Will it work fine and, mainly, will 5G networks be accessible outside US? Tks
Click to expand...
Click to collapse
Yep, the US models have numerous disabled features and run late on updates. I've also noticed it's crippled or disabled while roaming. I'm not sure if it's directly from disabled features or it it has been blocked by telcos because it malfunctions. (It gets kicked off cell towers in the US)
The US model has slightly different radio hardware so I would expect problems flashing the OS from another region. There are some tricks for changing the feature lists that might be a safer bet.
kevinmcmurtrie said:
Yep, the US models have numerous disabled features and run late on updates. I've also noticed it's crippled or disabled while roaming. I'm not sure if it's directly from disabled features or it it has been blocked by telcos because it malfunctions. (It gets kicked off cell towers in the US)
The US model has slightly different radio hardware so I would expect problems flashing the OS from another region. There are some tricks for changing the feature lists that might be a safer bet.
Click to expand...
Click to collapse
How would one check what is and isn't turned on network wise??
I was able to flash the XQ-BC52 ROM in my XQ-BC62 hardware. So far, working fine in 4G+, but I´m in area with no 5G coverage. Tomorrow I will go to an 5G area and check f it worked. If not, I will try the XQ-BC72. I will keep you posted.
kevinmcmurtrie said:
Yep, the US models have numerous disabled features and run late on updates. I've also noticed it's crippled or disabled while roaming. I'm not sure if it's directly from disabled features or it it has been blocked by telcos because it malfunctions. (It gets kicked off cell towers in the US)
The US model has slightly different radio hardware so I would expect problems flashing the OS from another region. There are some tricks for changing the feature lists that might be a safer bet.
Click to expand...
Click to collapse
Would you mind to message me what tricks you are talking about? Tks
marcofgn2 said:
Would you mind to message me what tricks you are talking about? Tks
Click to expand...
Click to collapse
Maybe something along the lines of Getting VoLTE and VoWiFi on unlisted carriers by flashing mbn file or 5II/1&5III VoLTE patch. [Guide to release the root] or https://band.radio/
I haven't rooted yet so I haven't tried them. I bring a T-Mobile LG Velvet 5G with me when I travel. It's a little slower but doesn't have all the telco problems.
Test done, xqbc-52 doesn't see 5G network as well. XQ-BC72 SEA is a no go, don't even recognize the SIM card in the phone.
Will try another firmwares and the tweaks kevinmcmurtrie mentioned above, but my feeling is: I paid the 5G price for the Phone and actually got a a 4G Phone. Very frustrated with Sony. Thinking seriously about going back to Samsung.
marcofgn2 said:
Test done, xqbc-52 doesn't see 5G network as well. XQ-BC72 SEA is a no go, don't even recognize the SIM card in the phone.
Will try another firmwares and the tweaks kevinmcmurtrie mentioned above, but my feeling is: I paid the 5G price for the Phone and actually got a a 4G Phone. Very frustrated with Sony. Thinking seriously about going back to Samsung.
Click to expand...
Click to collapse
But hey here's the pros, best physical camera sensors, Micro SD card Slot and headphone jack...
UPDATE!!! 5G is working!!!!! After Several Attempts, I finally got 5G. What worked for me, in Claro BR Network, was flash a Hybrid ROM. I Flashed A XQ-BC52 ROM with Modem files from XQ-BC72. So far everything working as it should. My only concern, next month I will be in Germany, may I have trouble in LTE over there with XQ-BC72 modems?
Ainz_Ooal_Gown said:
But hey here's the pros, best physical camera sensors, Micro SD card Slot and headphone jack...
Click to expand...
Click to collapse
Tks for the spirits up Ainz_Ooal_Gown. The main reason I Bougth Sony 1 iii is the 3,5 mm jack. I hate USB adapters......
Ok, major setback. it worked for 3 hours and when I turned on my second Sim card the phone 5G was gone. Turned it off, reset radio configs, but no success. Apparently turning the second sim on override the BC72 configs. Time to get serious now and root the phone, what I'm very reluctant to do.
marcofgn2 said:
UPDATE!!! 5G is working!!!!! After Several Attempts, I finally got 5G. What worked for me, in Claro BR Network, was flash a Hybrid ROM. I Flashed A XQ-BC52 ROM with Modem files from XQ-BC72. So far everything working as it should. My only concern, next month I will be in Germany, may I have trouble in LTE over there with XQ-BC72 modems?
Click to expand...
Click to collapse
How did you manage to do that? Could you please explain the process?
Settings, Network & internet, Smart connectivity and turn off. On by default. See if it works. I found where I am at it tends to look for wifi over 5G.
arjun_m4 said:
How did you manage to do that? Could you please explain the process?
Click to expand...
Click to collapse
That's what I want to more..i have the xq-bc72 on mint mobile and no5g.even my kids xiaomi 11 5g ne has 5g on mint.
I am on Mint, T-mobile towers. 5G works great, has to be in your settings. For MMS use the T-mobile APN settings.
I would like to activate 4g+ on my xq-bc52!
how to do ?
thank you.

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