Develop Bugs

Radio problems.

So, i'm in the UK with my nice shiny OP3 (on Three UK) - I am rooted with twrp, but same applies on stock.
The radio in this phone seems to prefer H+/3G to 4G, even though where i live, i have full bars on both. My nexus 5 always prefered 4G, and the OP3 is set to prefer 4G but 90% of the time drops to 3G/H+
Another interesting thing, if i use the testing menu to force LTE only, even if it's on 4G already, completely stops any signal getting through for a number of minutes until it decides to connect sometime later. I have full LTE signal in my room too.
Is this a radio problem that could be solved in the future with a software update? not seen anyone else with this issue!
FYI, when it is on 4G, it's super fast and stays connected until a reboot, where the whole process starts again
Norman

manor7777 said:
So, i'm in the UK with my nice shiny OP3 (on Three UK) - I am rooted with twrp, but same applies on stock.
The radio in this phone seems to prefer H+/3G to 4G, even though where i live, i have full bars on both. My nexus 5 always prefered 4G, and the OP3 is set to prefer 4G but 90% of the time drops to 3G/H+
Another interesting thing, if i use the testing menu to force LTE only, even if it's on 4G already, completely stops any signal getting through for a number of minutes until it decides to connect sometime later. I have full LTE signal in my room too.
Is this a radio problem that could be solved in the future with a software update? not seen anyone else with this issue!
FYI, when it is on 4G, it's super fast and stays connected until a reboot, where the whole process starts again
Norman
Click to expand...
Click to collapse
Check your APN.

papi92 said:
Check your APN.
Click to expand...
Click to collapse
APN Is exactly the same as my nexus 5, and i even added a new one. Same deal.
I'm an IT Professional, just not a developer. i've done everything i can think of. 4G does work, but only when it wants to. My phone is also registered with my carrier correctly.

Bump on this anyone?

I am having a similar problem I guess. I have the dual sims installed and one sim randomly shows no range. Further, the network preference is not the way it is supposed to be - Chose it as 4G and if 4G is not detected it falls back to 2G.

Same issue forcing lte fixes lte for me but then no calls come through
Sent from my OnePlus 3

dkotoric said:
Same issue forcing lte fixes lte for me but then no calls come through
Sent from my OnePlus 3
Click to expand...
Click to collapse
Same as you. Anyone know how to fix the network priority to lock onto LTE first and then drop to 3G for calls?
Sent from my unknown using XDA-Developers mobile app

cdkg said:
Same as you. Anyone know how to fix the network priority to lock onto LTE first and then drop to 3G for calls?
Click to expand...
Click to collapse
I did notice when I do have LTE it's fine but it won't re lock onto LTE after a call on Three where it has to drop to H

I'm having a problem where the phone catches 4G+ "carrier aggregation" and it'll jump from to 4g+ to 4g and back to 4g+ really fast like almost flashing . And speed test are showing low numbers. T-Mobile USA.
Sent from my ONEPLUS A3000 using XDA-Developers mobile app

Same here. Sometimes it just locked to 3g/h+ in a strong LTE area for no reason. I'm on stock oos with one sim and 1 apn. Sometimes I need to reboot the phone to get LTE back.
Sent from my Pixel C using XDA-Developers mobile app

I first put my sim into slot 1 when I first got the device, I was having the exact same issue. I found that the data priority sim, or if you only have one sim needs to be in sim slot 2.

mrnovanova said:
Same here. Sometimes it just locked to 3g/h+ in a strong LTE area for no reason. I'm on stock oos with one sim and 1 apn. Sometimes I need to reboot the phone to get LTE back.
Click to expand...
Click to collapse
Yes exactly. And even then it doesn't show up straight away despite 3/4 and usually full signal. Sometimes just putting it into standby mode and leaving it 20mins can sort it... Until I get another call lol. Wondering if it's just a software or firmware issue that could be patched. Lte is fine it's just never preferred despite the options being set

papi92 said:
Check your APN.
Click to expand...
Click to collapse
APN is not the universal response. Here he faces a problem of inaccurate network type choice, APN is only to have acces to internet through the provider's proxies. It's a radio problem clearly, the baseband is probably to be corrected by OnePlus.
It's really a strange thing to see those network type issues, MMS issues are still present after all those years.

Striatum_bdr said:
APN is not the universal response. Here he faces a problem of inaccurate network type choice, APN is only to have acces to internet through the provider's proxies. It's a radio problem clearly, the baseband is probably to be corrected by OnePlus.
It's really a strange thing to see those network type issues, MMS issues are still present after all those years.
Click to expand...
Click to collapse
This is what I thought. It's probably an easy fix for oneplus or rom developers. Custom radios are nothing new. Let's hope so anyway!

This is happening to me as well. I'm on three in a strong 4G area but it always prefers 3G it's so annoying hope it gets fixed soon.
Sent from my ONEPLUS A3003 using Tapatalk

same problem here.
i tested op3 with 3 different carriers
on two of them - lte no problem, instant connect...
on third sim - slow connection, frequent out of range. almost no lte.
tested third sim on iphone - instant lte connect, no problem.
seems like a incompatibility with an selected cellular operators.

DrSun said:
same problem here.
i tested op3 with 3 different carriers
on two of them - lte no problem, instant connect...
on third sim - slow connection, frequent out of range. almost no lte.
tested third sim on iphone - instant lte connect, no problem.
seems like a incompatibility with an selected cellular operators.
Click to expand...
Click to collapse
Could be but I'm doubting it. OP3 Has full support at least for my carrier on both bands they use (3 & 20).. Never know, the devs here will figure it out if oneplus don't

So i am in Germany right now using Vodafone with LTE enabled and enough datavolume but i am surfing with 2g speed. What is this? Checked the apn and everything is fine. On my S5 i am flying through the net ...
---------- Post added at 03:00 PM ---------- Previous post was at 02:58 PM ----------
erdock said:
So i am in Germany right now using Vodafone with LTE enabled and enough datavolume but i am surfing with 2g speed. What is this? Checked the apn and everything is fine. On my S5 i am flying through the net ...
Click to expand...
Click to collapse
Even loading google is a struggle

Same issue here, have never got it to say 'LTE' for me since I got the phone, best it does is 4G whilst my Galaxy S5 would happily pickup LTE. Just wondering what UK users have there preferred network type set to? Mine is on GSM/WCDMA/LTE I assume that is right as that is what it went to itself and have tried LTE or LTE/WCDMA too.

RetroFlux said:
Same issue here, have never got it to say 'LTE' for me since I got the phone, best it does is 4G whilst my Galaxy S5 would happily pickup LTE. Just wondering what UK users have there preferred network type set to? Mine is on GSM/WCDMA/LTE I assume that is right as that is what it went to itself and have tried LTE or LTE/WCDMA too.
Click to expand...
Click to collapse
Sorry, i mean my OP3 shows LTE in statusbar but it runs with 2G speed

Xiaomi Mi Mix 2 not reconnecting automatically from EDGE (E) to 3G or 4G after a call

I started this thread as a bug report in the Xiaomi forum, but no solution has been forthcoming.
http://en.miui.com/thread-2390770-1-1.html
I have also sent official complaints emails to Xiaomi at
[email protected]
Device: Mi MIX 2; MIUI Version V9.5.6.0.ODEMIFA; Reproduce rate: 100%; ROM version: Global Stable ROM; Country/Region: Nigeria
Description: Xiaomi Mi Mix 2 not reconnecting automatically from E to 3G or 4G after a call. It stays permanently on EDGE (E) unlike other Android phones that reconnect automatically to 3G or 4G after termination of phone calls.
Steps to reproduce:
1. Put Mi Mix 2 on 4g
2. Initiate or receive a call
3. Notice networks drops to E when receiving call.
4. End call.
5. Notice network remains on E after the call, and does not automatically reconnect to 3G or 4G as other Android phones do.
My post might be long, but it is due to the fact that I am feeling disappointed that I have not seen a solution in the MIUI and other forums.
1. My Mi Mix 2 does not reconnect automatically back to 3G or 4G after a call (when I initiate or receive the call). It stays permanently on EDGE (E) even with full 3G and 4G signals.
2. Before and after this update, I still have the issues of the Mi Mix 2 switching to EDGE (E) during a call and not automatically switching to the available 3G or 4G networks after the call; it stays on EDGE (E), which means that I have to manually restart the phone or go to the phone info (using the Internal memory steps to take change it to LTE or UMTS or WCDMA).
3. After manually changing to LTE, UMTS, or WCDMA, it still changes back to EDGE (E) during and after a call, and I have to go through the annoying steps once again.
4. From the forum posts, including the MIUI forums, I now know that this problem has been with the Xiaomi phone models right from the onset. I want to point out here that I never experience such issues with all the other Android phones that I have been using – none. They all reconnect automatically to 3G or 4G immediately the calls are terminated; I don't have to reboot the other Android phones to achieve this. That this issue has been with Xiaomi for a long time is beyond my comprehension. Why have the Xiaomi Engineers not fixed it?
5. The upgrade to the new MIUI Official V9.5.6.0.ODEMIFA (MIUI9) Stable version did not resolve this issue of the Xiaomi Mi Mix 2 not reconnecting automatically from EDGE (E) to 3G or 4G after a call.
I would like to find out if Xiaomi has come out with a permanent solution to this problem, and where I can find it? This does not happen with other Android phones/manufacturers. What is the permanent fix?

I have the same issue with my Mix 2. I have to go through all kinds of configuration settings such as testing>phone info (*#*#4636#*#*), APN, pulling SIM, inserting different SIMs, turning off VoLTE, etc, after voice call just to get LTE back. Newest MIUI 9.6.1.0 still hasn't fixed problem. Will never buy another Xiaomi phone until fix is released.

It's just disheartening to note that the latest ROM update has not resolved this issue. I am in constant communication with the Xiaomi Global Support team via emails, and will continue to be until they fix the issues.

Try LTE/CDMA/UMTS AUTO PRL
Works perfectly for me.

Twotems said:
Try LTE/CDMA/UMTS AUTO PRL
Works perfectly for me.
Click to expand...
Click to collapse
Thanks!
I started going through the list but didn't get to that one yet.
Switched the setting, made a couple of calls then rebooted, LTE & VoLTE both reconnected.
Will continue to monitor.

I had a problem with the signal too and i switched to this setting and it works like a charm.
The settings you had were for China so thats why it didnt work well.
PS. you have to manualy change the settings on every reboot. Remember!

Slow 4G Speeds, connectivity issues. Modem, Baseband

Basically the Redmi note 5 Pro and Ai are really slow for internet speeds, unstable I compared it to Samsung S7. This post talks about the same problem.
https://forum.xda-developers.com/redmi-note-5-pro/how-to/low-signal-poor-4g-speeds-t3777925
It was so slow i was going to sell this.
When using a custom roms, the LTE connection would turn off even tho it was turned on, you click it and it says turn off LTE connection even tho it's already stopped working, no LTE icon present. Then after turning it off and turning it back on it works again, till it randomly disconnects itself again. Restarting the phone while LTE was working would normally mean it had the same problem when phone started up, LTE icon missing internet not working you click on it and it says turn it off, it's on but not working.
MIUI didn't seem to disconnect those issues above still hopelessly slow speeds however.
I found someone else who suggested flashing a modem to fix it, however this didn't work for me as there's a massive list modems i tried and didn't fix it below. Had to use aeroplane mode after each modem flash and turn it off and wait a bit before turning on LTE to get a connection.
What did fix it was this post i came across from another person.
As far as I see it's issue with MIUI9. What is my conclusion so far is, with MIUI9, there is an issue with network switching like from 4g to 2g or 3g and the phone gets briefly disconnected from network . This is more often when you use data than voice.
I use two sim cards so I've currently got my data sim set to LTE only and my calling sim is just on WCDMA as soon as i did that my download speeds match my S7 just as fast which wasn't even close to been possible before i did this. So i'm convinced that the persons post is correct and it keeps disconnecting from 4G to try and connect to 3G and results in an unstable connection. That and i ran speedtests against all those modems listed and couldn't get these speeds.
It might be possible to set my calling sim to WCDMA/LTE and data to only LTE not tested so far, so its working but if i lose LTE connection it would normally drop to WCDMA so with LTE only that could be problematic. Doesn't seem to disconnect anymore and maintains the LTE during phone restarting.

This is a list of all the modem, baseband files i tried.
These where from China rom.
9.5.16.0
8.8.9
8.8.3
8.6.28
8.6.21
8.6.16
The rest were Global, Stable and Beta
10.0.1.0
9.6.4.0
9.6.3.0
9.5.17
9.5.14.0
9.5.13.0
9.5.6.0
9.2.7.0
8.9.20
8.9.13
8.9.6
8.8.30
8.8.23
8.8.16
8.8.2
8.7.26
8.7.12
8.7.5

I just got the Mi 8 Lite yesterday. The speeds showing for mobile data on the phone are really slow... and downloads from the Play Store take forever (a few seconds for each MB). Trying to download the Android 9.0 update was painfully slow. Eventually I resorted to putting the SIM back into my old device and using that as a hotspot to update my phone via "wi-fi".
I have now placed the SIM back into the Mi 8 Lite and the mobile speeds are still slow. I'm really confused, however, because when I use the Mi 8 Lite as a hotspot to share the data with my old device, the downloads on that phone are quick.
So it seems that the Mi 8 Lite is just struggling to make internal use of the data speed that it is actually receiving from my network... it still transfers the full speed to other devices via the hotspot.
Any suggestions?

Signal decreased after MIUI update

I have a redmi 7 3/32. After I upgraded to MIUI v10.3.4.0, the reception of the signal decreased, now I always have an H (3G) signal inside my house and 4G outdoors. Before the update I always had 4G LTE. I have also noticed that now when activating the use of data does not connect to the internet, I have to activate and deactivate the airplane mode to connect to the internet, something that did not happen before this update. Someone else happens? And what can I do to solve this?

I am on 10.3.6.0 and didnt face any of this issues.. .
Update to 10.3.6.0

i am Update to 10.3.6.0 indie and no problem

Just update to a new version, bro.
U can try install a global rom.

Question Mobile data interruptions on POCO F3 - is there any cure?

Hello, I tried searching on XDA and elsewhere but could not find an answer so I hoping to receive help by writing my issue here.
I have bought two POCO F3's 128GB & 256GB on Amazon & Aliexpress respectively.
They both have the same issue when using mobile data (4g) loading websites and doing voice & | video calls like FB messenger there are interruptions like for a second there is no sound or video freezes. It does not happen on wifi or other phones.
I tried resetting APN, selecting proffered network to LTE, rebooting, switching SIM slot, resetting wifi, mobile and bluetooth settings. Updated both phones to MIUI Global 12.5.1 still no luck.
Country Lithuania (EU) carrier TELE2
We really like the phones, but this is pretty annoying as we do a lot of video calls due to quarantine and what not.
Amazon suggested to replace the phone but seeing as two of them having the same issue it will most likely will not help.
Anyone experienced these issues and came up with solution?

From what u described, seems to me is a bandwidth/mobile data speed problem. Looks like is not enough bandwidth for video call to work properly. So, what is ur bandwidth provided by ISP? What mobile data plan had from ur telephony provider? Maybe ur mobile data signal is low in the place where u make the call from. It can be so many reasons for the issue u confront with, other than a problem with phone itself (a hardware/software issue).

you can also try the latest china stable firmware 12.5.4

Alin45 said:
From what u described, seems to me is a bandwidth/mobile data speed problem. Looks like is not enough bandwidth for video call to work properly. So, what is ur bandwidth provided by ISP? What mobile data plan had from ur telephony provider? Maybe ur mobile data signal is low in the place where u make the call from. It can be so many reasons for the issue u confront with, other than a problem with phone itself (a hardware/software issue).
Click to expand...
Click to collapse
Hi, ty for reply. That should not be an issue, reception is great and we tried it in multiple locations. Our previous devices Iphone 6s/ Poco F1 worked flawlesly with the same carier.
Here is speed test done on mobile data.

Any other ideas?

Found this thread here and I found a solution. Apparently there's an issue with network interruptions in general, especially on phone calls. This can be avoided by switching on VoLTE and WiFi-Calling. This is what I found out over time.
Here's the fun part though: Through a little bit of research this turned out to be a vodafone-problem. I am just guessing you guys will be either also on vodafone or on the corresponding bandwidth in your country.
It seems to be a bug in the F3, but also something that happens when VoLTE is not activated for your SIM card. The phone will try to use VoLTE and this connection will fail, forcing the connection to reset. It will be back in 10-20 seconds, but this is of course super annoying whenever a stable connection is needed (like phone calls...)
Enter *#*#86583#*#* (86583 = VOLTE on dialpad) on your phone. and it will give you a feedback that the carrier check has been disabled. Note that this doesn't mean that VoLTE has been disabled. Checking the network for the capability is disabled then, which makes the setting visible on the SIM card settings. Same works for VoWifi btw.
Try playing around with those settings and see if the connection drops persist. I have no logical explanation why this is happening because what I am telling you is obviously call-related - and I do realize that what you're describing is about the data connection. For me this was related however and solved my issue.
Possible solutions:
a) try to get your service provider to switch on VoLTE for you (this worked for me). You're going to need to call support for that. They will reset your SIM card in the process. Reboot your phone and be done with it.
b) If a) is not possible, deactivate VoLTE in the menu that you activated with the code above. If you're lucky, this will stop the phone from trying to get this type of connection working, even though it's not available. This is broken exception-handling on the phone's side and Xiaomi promised to fix it. They are aware of the bug (since Aug 20th btw) and promised to push a fix into the next MIUI release
c) play with the settings and try to get the phone to not use alternative protocols, just 3G and 4G, also deactivate Wifi-Calling.
Hope this information will help somebody. If all goes well, Xiaomi will fix it and this will behavior will be gone in the next release.

same issue for me with 12.5.7
data interruptions all the time and full signal loss
very disappointed with this device from the day i got it.

O thought I'm the only one facing this problem.
It's so annoying to get an interrupted connection in the middle of the game.

not only game, and calls, i have too much trouble to get throught a call.

Hello all,
i was also affected by a similar issue.
In my case the symptoms were:
On mobile data/5G some apps would be accessing the internet but others wont..
I was able to overcome this by resetting the access point settings and then applying the ones found here:
Cytamobile-Vodafone Cyprus APN Settings for Xiaomi Poco F3 GT - APN Settings
apn.how
I hope it helps...

My fix for this occasional issue is to set the phone to '3g' only in network settings, then flick it back to '5g'. It seems to be area specific for me. Very bizarre.

ntemis021 said:
not only game, and calls, i have too much trouble to get throught a call.
Click to expand...
Click to collapse
I have the same problem, it helps to have the settings volte and vowifi enabled. Sometimes it looks low cell signal and loosing the connection.
Has anyone return for service the device?

It looks like we still have this problem, my F3 modem is crashing every few hours especially when it switches bands, very annoying.

Magister54 said:
It looks like we still have this problem, my F3 modem is crashing every few hours especially when it switches bands, very annoying.
Click to expand...
Click to collapse
It really is! We need a bug bounty for this

Hey I ran into the same problem in Hungary Vodafone Poco F3, 14.07 MIUI
4g net is working flawlessly but
Network connection is lost when start dialing
Nobody can reach me on phone
Enter *#*#86583#*#* (86583 = VOLTE on dialpad)
VoLTE select option turn on/off
Enter *#*#869434#*#*
VoWiFi select option turn on/off
I tried to switch on/off both but no solution just yet
sby has answer for this?
Where should I post this problem to be solved?

I also have this problem and I am from Iran. My mobile ROM is the global version. It seems that this problem is caused by the Poco F3 mobile hardware itself. If anyone finds a solution, please let me know, thanks.