No signal issue from nowhere - Xiaomi Poco F1 Questions & Answers

It happened after i turned on flight mode,when i turned off it the first sim has signal and the second one doesn't!
when i switch the mobile data to first sim the signal comes back,
if i switch the network from 4g to 2g the signal comes back!
everytime i turn on mobile data in that sim the signal completely goes off!
i checked if it is a sim problem by switching slots didn't work, then i put the sim to another phone the signal is strong and mobile data works like a charm so its not a sim problem at all! please help me out!

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Optimus dropping calls in 2G mode

Hi Guys,
My optimus calling service is not reliable at all in 2G mode. Is it just mine or there is really a problem with 2G networks. When I switch to 3G everything seems to be ok. Sometimes it drops the connection during the calls. Sometimes I can hear the other side but they can't hear me.
Overall it is a very good phone apart from calls dropping.
No issue
Been using it for a week now. Have flagged the 2G explicitly to conserve battery. Not had any case of call drops or one way traffic.
Cheers,
Vikram.
I use only 2G and I speak a lot. No problem at all.
Thanks guys, so I assume that next step should be to leave it for repair. I'm afraid that they will return it without any changes as this behaviour is not so regular.
Also my phone sometimes drops calls. I've resolved the issue replacing SD card, from Sandisk 16gb class 2 to Transcend 8gb class 4. Now works well, hope the firmware update resolve the SD compatibility problems
Is it really possible the only reason to be in the SD card? There is no much sense on this but who knows?!
I think it's not a sd-card problem, because i have the same problem here in Hamburg/Germany and for me it's the provider 'O2'. Same thing before with my Samsung Spica and my girlfriend ('O2' too) has a X10 mini, same calldrops...
Maybe you can try the simcard with another mobilephone!?
Greetings
Yes I can confirm the drop calls with o2 germany. I was two weeks ago in Köln and had the same problem but to be honest I had similar problem with e-plus.
matematic said:
Hi Guys,
My optimus calling service is not reliable at all in 2G mode. Is it just mine or there is really a problem with 2G networks. When I switch to 3G everything seems to be ok. Sometimes it drops the connection during the calls. Sometimes I can hear the other side but they can't hear me.
Overall it is a very good phone apart from calls dropping.
Click to expand...
Click to collapse
I use 2G mode to save battery life. I've not had any problem so far.
I have the same problem too. I will try to figurate if excists in 3g mode
Maybe your network has issues , or your signal is quite weak . I have full signal in 2g at all times
The problem could be strictly with the network reception in your area where 2g is very limited. With repairs they may be unable to detect anything wrong with the phone itself. See if you can find someone else on the same network, preferably different phone, and checking their status on 2g.
unfortunately my home has excellent reception, i have a second old device(nokia 6310i) and it works perfect with it
I have this problem too + missed calls.Keep reading but no solution so far.Flashed to prime v2 and nothing.I don't think the problem is in the network because i try with two different sims and problem exist but will buy another sim and see.
Same problem here. Also the voice quality is really horrible and sounds like it's coming through a pipe LOL.. Is this normal or?
FnH84 this is not normal.I thing that is software problem(other brands has the same problem).Maybe any process or application i don't know but this phone is useless as a phone.Everiting else works great but ............I will keep trying other rom-s other sims and keep reading for solution.
Ok, i found a convient solution for me. downloaded ,status bar 2g 3g, from market. i have always data off unless i need it(in 3g mode always). this program show in status bar if your network is 3g or 2g without having data on all the time cause consumes much battery. give it a try
Ok i install the program but it always shows 2g even my data is off.Is that normal.What the program show in your statusbar.
did you uncheck the 2g mode from the settings?

I need some help with my Galaxy note

Okay so i have the i717 galaxy note and i am using it on T-mobile $30 a month 5gb of 4g(hspa+) ,100minutes ,and unlimited text but it never uses HSPA+ it uses UMTS:3 and says 3G on status bar but it always switches to 3G (UMTS:3) to H+ (HSPA+) is there a way to force to keep it only on H+? and once in a while it says i removed my sim card when i didnt is it because the back of my sim card is getting warn out ? when i look at contacts on back of sim it looks scratched from im slot should i replace my sim ? is that the problem or what? please help thanks !
It uses 3g when H+ is not available, so if your not in a spot with H+ it has to use 3g you cannot stop it from doing so
Besides, speed on a network is determined by the number of users connected to that tower. An icon is only an icon, and doesn't actually indicate your speed; it only shows you the type of tower you are connected to.
im at home and i see it constantly switching over and i went the settings > about phone >status and it shows what network
I think you should tell t-mobile to put a tower in your yard.
And another one in mine ....g

constantly dropping signal internaltionaly vodafone

Hi.
I was wondering if anyone can help me out.
Im currently in Albania using Vodafone sim card. My signal sucks most of the time I have no signal its comes once in a while for couple minutes maybe and then leaves again.
When I put the sim card in my cousins S3 (which his s3 is from here) it works fine, full bars 3G
So its leading me to believe its my notes fault.
My APN settings are good because when the signal comes for that short time my phones data and voice work as they should

Xperia Z2 D6503 Only GSM Signal (No 3G/4G)

Almost 4 months of having this problem. I dont know exactly what have caused this. I have a D6503 device, and when I tried to register to 3G or 4G network, the device looses the signal "emergency call only", but when I check GSM only the signal comes back. I remember the time when I open *#*#4636#*#* and selected USA band only, that time I looses signal. I reflash my D6503 using flash tool. and the signal comes back. but I dont know exactly if the cause of having no 3g or 4g signal was the result of that. i cant remember anymore. I hope someone here could enlighten me or give me some idea if what exactly is the problem of this unit. Im sure that the simcard reader is fine.
borjok536 said:
Almost 4 months of having this problem. I dont know exactly what have caused this. I have a D6503 device, and when I tried to register to 3G or 4G network, the device looses the signal "emergency call only", but when I check GSM only the signal comes back. I remember the time when I open *#*#4636#*#* and selected USA band only, that time I looses signal. I reflash my D6503 using flash tool. and the signal comes back. but I dont know exactly if the cause of having no 3g or 4g signal was the result of that. i cant remember anymore. I hope someone here could enlighten me or give me some idea if what exactly is the problem of this unit. Im sure that the simcard reader is fine.
Click to expand...
Click to collapse
I hope someone here could help me figure out this problem. The 3G and 4G signal on my place is OK. I have a correct APN for this. But the problem is, everytime i enable data, i looses my signal, and my simcard cant register to the network. and a message network not available. When i search for networks, LTE, 3G, GSM will appear, and when I click LTE signals, the phone cant register to network, and I will have no signal then. If i choose GSM (2G), that's the time that I can have a network signal. Would it be posibble that the antenna are defective? (the smaller one where the other end of the wire attached, I think its the board rf aerial PCB flex cable ? I hope some one here can help me

3G not connecting

I recently purchased an Xiaomi Redmi Note 3 Pro phone (kenzo), it covers all the bands that rogers uses in my area in Canada, I believe.
https://en.wikipedia.org/wiki/Rogers_Wireless
I can connect with the phone on LTE, HSPA+ with no problem, if available. Sometimes, if I am in certain area's, the signal indicator drops to 3G .... it shows a decent signal, but no calls or data can go through.
In this example on the following chart, the first WCDMA connection,my phone only indicates 3G and I can not make a call or use data. When my call attempt is done, it goes back to LTE. Then I try again. Then for the second WCDMA connection on the chart, I am connected as H+, I can make a call and use data. Whenever this phone connects to CID 31072 the problem happens. When I connect to CID 31075, no problem. These are just examples of towers that I reach from my home. I get the same problem occuring other areas.
Any suggestions on what I need to change on my phone? Is my phone making a kind of 3G connection for some reason, which Rogers doesn't support? I have tried everything I can think of, Miui dev versions, CM13, LineageOS 14.1 etc, change Android Radio Menu settings, etc.
Nothing seems to fix this issue.
Any advice would be greatly appreciated!
I have been using Network Signal Guru, and have figured out that the phone will connect calls data on 3g if the band it finds is B5-850M .... if the tower tries to connect to is B2-PCS-1900 the call fails.
I tried to block the use of band 2 with Network Signal Guru, but it seems to still use it when it finds it.
I have since flashed a LineageOS rom and used the Network Signal Guru to disable band 2 WCDMA. The phone has not been experiencing the issue at all since. I am cautiously optimistic that I have found a solution. Still not sure why this band doesn't work here though.

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