Bluboo S1: unable to connect to carrier network (AT&T) - Android Q&A, Help & Troubleshooting

I received a Bluboo S1 this past Friday. Unfortunately, it is unable to connect to AT&T for voice calling, I am aware that I will not be able to do LTE, but calls are essential, of course. The signal shows 0 bars, and gives the standard "no network carrier" error if I attempt to make a call.
The phone is stock, running 7.0. Nothing has been modified. The build number is Bluboo_S1_Helio_P25_L_V04_20170908. The SIM card is tested and is good.
I know that I can just exchange this phone, and have already got the ball rolling on that. But, as usual, I like to correct issues, so I would like to figure out why I am unable to make phone calls.
Any help would be greatly appreciated.

I exchanged the phone today.
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I have thé same problem

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[SOLVED] Cannot use GSM radio - help needed!

I have since discovered that my IMEI has been blocked. This phone was bought off eBay in January but apparently the block was only placed on August 7th. I'm gutted, I'm really hoping this can be resolved or that I am covered by insurance.
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Hi everyone,
I'd greatly appreciate any help anyone can give me. Here is what happened:
About 2 weeks ago I upgraded radio from 1.38 to 1.50, which worked and everything was fine.
Last week I went on holiday to a little place on the beach, where signal has normally been a problem. Not so this time, I had plenty of signal and was talking and texting fine.
On Tuesday it worked all morning and then in the afternoon the signal dropped off and it said "no service". I cycled the phone radio a few times and rebooted the phone, all to no avail. I concluded that the local cell tower had a fault and that I wasn't in range of another.
On Wednesday we took a trip and, as I expected, a few miles down the road my phone picked up signal again, consistent with the faulty cell tower hypothesis. I recieved a load of texts that had been waiting for me, made a few calls and everything was fine. When we got back to where we were staying, the signal held - I presumed the fault had been fixed.
Later that evening the signal dropped out again as before. I assumed that perhaps the fault hadn't been sufficiently fixed in the cell tower, so while annoying I presumed when I got to a different area the signal would come back like it did before.
However, it didn't. We came home on Friday and it hasn't picked up a signal, just says "no service". If I manually search for networks it finds O2 (as well as all the others) and I can select it, but it still says "no service".
I plugged in a T-Mobile sim, and it found signal immediately, BUT I cannot send/recieve calls or texts, people calling me hear a strange problem about it being unable to connect their call, and text message delivery reports give the same (not the message that one gets if the phone is switched off) - so it is obviously on the network but something is stopping it using the network - when I try and make a call I instantly get those four beeps which indicate the call has ended.
I then phoned O2 and said I think my SIM is dead, and they agreed and are sending me a new one. However, I then tried my old O2 sim again and got a brief signal, but still the same problem as the T-Mo sim - cannot send/recieve calls/texts/anything.
My O2 sim now says no service, although I have tried it in another phone and it works fine.
Since then I have re-flashed 1.38, hard reset the OS (Sleuth's v3) and flashed the O2 WM6 official rom with 1.47, all making no difference. I've tried forcing 2G and 3G and particular frequencies (it usually says it cannot apply these band settings, but after several reboots I sometimes manage to change it).
So, in summary:
Signal is very intermittent and usually says "no service".
Even when I do have signal, I cannot send/recieve calls/texts.
My O2 sim definitely works.
I have tried radios 1.50, 1.38 and 1.47 to no avail.
I have hard reset the ROM (Sleuth's v3) and flashed the O2 official ROM to no avail.
Desperate for help! Many thanks
I have also cleaned the SIM, SIM contacts in the phone, and checked that I can access the SIM card from the phone, and I can get the phone's IMEI etc so at least part of the radio seems to be working, and as mentioned before the SIM definitely works.
Thanks
Update:
I have tried Orange post-pay and Orange pre-pay sims and they both work fine, so it doesn't appear to be my phone that has broken.
However, my original O2 sim continues to work in another Nokia phone, suggesting that the sim isn't broken.
It may just be the pairing of that sim with my phone, which is the only thing I can think of. Does the Hermes apply sim "profiles" to sims which are inserted? Have I messed up the profile associated with that sim? My new O2 sim should come next week so we will see if that one works.
Also, the error messages of the text delivery reports sent to my phone while my O2 sim was in it say "Interworking Not Available" (this is from an Orange phone). Any idea what that means?
Thanks to anyone who can help.
Oliy said:
Update:
I have tried Orange post-pay and Orange pre-pay sims and they both work fine, so it doesn't appear to be my phone that has broken.
However, my original O2 sim continues to work in another Nokia phone, suggesting that the sim isn't broken.
It may just be the pairing of that sim with my phone, which is the only thing I can think of. Does the Hermes apply sim "profiles" to sims which are inserted? Have I messed up the profile associated with that sim? My new O2 sim should come next week so we will see if that one works.
Also, the error messages of the text delivery reports sent to my phone while my O2 sim was in it say "Interworking Not Available" (this is from an Orange phone). Any idea what that means?
Thanks to anyone who can help.
Click to expand...
Click to collapse
Shot in the dark here: how did you get your Hermes? Could it be blacklisted from O2 - i.e. could it be stolen from an O2 subscriber. (I would assume by the person you got it from, I am not accusng you of anything!)
Hi Todd,
Thanks for your reply. It's not something I'd thought of but it could fit the scenario. I got the phone off eBay back in January and had no problems with it until now. It's actually a T-Mobile branded one, (i.e. the MDA) rather than the XDA Trion. When I phoned O2 to ask if my account had been blocked and to get a new sim the person I spoke to said there was nothing to indicate that my account would have been blocked, which would presumably include any blocked IMEIs that were listed there. Also, if the phone had been blocked after being listed stolen it would have been blocked on all networks wouldn't it? If my new sim doesn't work I will phone O2 and ask them if my IMEI is blocked, so thanks for your suggestion.
As updated in the first message, my IMEI has been blocked, causing all the problems. The reason the Orange sims worked must be because the block hasn't propagated to the Orange network yet.
Hey i discovered i had the same problem today aswell i bourght the phone of Ebay for the first day it was working then next day i upgraded to WM6 and it stop working i did some research on why it stop working and here it was
Orange & O2:
If you place an active orange or
O2 sim into a blacklisted handset you
phone will not show any signal strength
at all! If the handset is a Nokia then a
"SIM card registration failed" message
will also be displayed. If your handset is an
Ericsson then an "Invalid Mobile" message
will be displayed. For most other manufacturers
the handset will simply show no signal!
Vodafone & T-Mobile
If you place an active Vodafone or T-Mobile sim into a blacklisted handset, the phone will appear to function perfectly UNTIL you try to make an outgoing call. When you try to call out from the handset you will hear a sequence of beeps and then the call will be dropped!!
wow nice story man , it seemed like a movie or something
anyway before i finish it i expected that your problem is that the phone IMEI is blacklisted . since its working with orange and other sims . its usually normal to get signal but u wont be able to make or recieve phone calls .
good luck .

Mobile network not available

Hi folks,
This is my first post so if I've done anything wrong please let me know. I think I'm experiencing quite a unique issue.
I have a Samsung Galaxy Nexus (Maguro) phone on O2-UK.
I'll try and summarise my issue
Currently I cannot make calls or send messages but can use 3g on the device.
When I put my girlfriends EE sim into the phone I can make calls and send texts
When I went to France with my O2 sim I could make calls and send texts
When I put my O2 sim into another device I can make calls and send texts
Whenever I try to make a call it states 'mobile network is unavailable' and when I try to connect to O2-UK in settings it states 'cannot connect at this time. please try again later'. The phone states emergency calls only but on the status bar it looks like it has a network connection and 3g can be used.
I've tried phoning O2 to setup the APN settings
It all started when I upgraded to CM12.1 from CM11. Although I have tried downgrading to the previous version and I am still having the same issue. I've tried wiping everything on the phone numerous times.
Is there anything else I can try, something I can wipe or a setting I can change?
Any help would be much appreciated!
If I can't sort it I'll grudgingly have to buy a new phone which is annoying because it only seems to have an issue with O2 in the UK
I had this when I upgraded from cm11 to cm13, all I did was turn on airplane mode for 10 seconds and switch it back on.
I wish it was that easy for me!
It seems that my phone has been blocked on my network (O2) since updating. Is there any way that an IMEI number can be involuntary changed during a root and installation of ROMs/radios?
I know this may be a very stupid question but my provider seems to think the IMEI number is strange, even though I purchased the phone from them in November 2011.
When I phone O2 their system says my IMEI number is different from when I type in *#06#.
Has anyone experienced this?
wattereus said:
I wish it was that easy for me!
It seems that my phone has been blocked on my network (O2) since updating. Is there any way that an IMEI number can be involuntary changed during a root and installation of ROMs/radios?
I know this may be a very stupid question but my provider seems to think the IMEI number is strange, even though I purchased the phone from them in November 2011.
Click to expand...
Click to collapse
Hmmm, you stated that the card worked in other phones right? I am pretty sure you stated that other cards also worked so to be honest, this is something you have to phone them up seriously about.
Yes when I put my girlfriends EE sim into the phone it works fone. Also when I was in France my sim card worked fine, I'm guessing because it was using other networks.
It gets even stranger, when I type *#06# into my phone I get an IMEI number. I used an online website to check the status of the IMEI number and it stated that my Samsung Galaxy Nexus (which I've owned from new) is actually an iPhone....
wattereus said:
It gets even stranger, when I type *#06# into my phone I get an IMEI number. I used an online website to check the status of the IMEI number and it stated that my Samsung Galaxy Nexus (which I've owned from new) is actually an iPhone....
Click to expand...
Click to collapse
I think we just found the source of our (well technically, your problem) problem. Now, do you have a nandroid backup or something that you are willing to restore to? I will look online for how to restore the imei.

LG v30 ER081 Unable to connect and emergency calls only error. Please help thanks

Hi , I am having trouble with my LG V30. I have the phone for about 9 months. It works fine but yesterday the phone stop working. I keep getting the ER081 Unable to connect in the wifi calling and emergency calls only in the phone calling. I have tested the phone with my wife sim card, it has the same error. My sim card work just fine in my wife phone. I also reset to factory setting 2 times. still got the same error. It looks like the phone is not reading the sim card so it can not connect to T-Mobile network. The phone works fine when connect to wifi. But in wifi mode still not able to make any phone call. Any expert has any ideas what is wrong with my phone ? Thank you for your help.
Have you called T-Mobile? Just a guess, but somehow your IMEI may have been blacklisted so that your phone can't register with T-Mobile's network.
Alternatively, it could be a hardware issue -- like the contacts not making a good connection to the SIM.
-- Brian

LG G5 H820 won't make or receive phone calls.

I ordered four LG G5s H820 off of aliexpress. They seemed to work fine at first. However when I inserted a SIM card, all three started showing the same problem: After a reboot, it would make and receive phone calls for about a minute or two, then it would not work anymore. Couldn't receive phone calls and If you tried calling it you would get a message saying the phone is either disconnected or had no signal or something like that. If I reboot the phone again the same would happen, able to make/receive calls for a minute then it stops. it would also sporadically work, say if someone is would be trying to call, the person calling would get a message the phone is disconnected/off/had no coverage, but once in a while, the call would go through, like after trying to five minutes.
I have full bars where I live and 4G LTE and the SIM used to test the phones was my own, which is working perfectly on my Zuk Z2 plus.
At first, I thought it was a GSM lock. Upon researching online it seems that the LG G5 gives you a straight message warning you when the phone is locked and askes for a GSM unlock code, that isn't happening here.
I also check all frequency bands available where I live and the phone indeed supports them all.
A third possibility that was considered is that the IMEI was blocked by a local government agency because they want to prevent people from importing phones directly, however, they have a tool where you can check if the IMEI is blocked, so I did and it is not blocked.
I'm still trying to figure it out. Maybe there's some sort of software shenanigans going on.
Next, I'm gonna try to jailbreak the phones and install a different operating system. Has anybody done that to this phone?

Xperia 1 J8810 not working in USA

Hi everyone. Last month, I bought a network unlocked Xperia 1 J8110 from a UK vendor for use here in the US. It arrived in excellent physical condition and is from a reputable seller with thousands of phone sales, so not just some random person. I checked behind them, and this phone is for sure network unlocked (see attachment) and from what I've read online, it should work in the US. I've owned plenty of UK phones from other brands and they worked fine here.
The trouble is, I have not been able to get this thing to work with any carrier! I’ve now tried Ultra Mobile (T-Mobile’s network), AT&T, and now US Mobile (Verizon’s network). When I plug in a SIM card, the phone recognizes it and reboots. However, after going through the activation process, I never get any 3G, 4G, or SMS functionality. This is ironic as I have Verizon and T-Mobile towers literally behind my house.
The furthest I got was with AT&T, which received the welcome SMS and showed full bars on network signal. However, the phone kept asking me to “Sign in to network” like it does with WiFi but there was no way to do that. This was after doing the full activation with AT&T, giving them my IMEI, receiving a phone number, a confirmation email and everything. With Ultra, I got the welcome SMS from them but was never able to send my own or do calls in either direction. With US Mobile, it does literally nothing. Wi-Fi and Bluetooth work fine, and I’ve checked for obvious stuff like airplane mode being on.
I then figured I’d see if maybe flashing a version of the J8170 firmware would help. I used NewFlasher to flash the “J8170_Customized US_55.2.E.0.165-R7C” as downloaded off of XperiFirm, which was successful. But it’s made no difference. The only issue I’ve seen others report online is that VoLTE might not work with international phones, but I can’t make calls or send texts period.
Can anybody think of what the root of this problem might be? I’ve tried to figure this out for myself, but I’ve reached a dead end in my searching online, maybe I’m just not choosing the correct keywords. Please let me know which other screenshots or other information is required and I’ll post them. I will be so thankful for any input at all. I appreciate it.

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