Develop Bugs

Poor WiFi Advice Needed

I've tried a few different ROM's but the only one I get decent WiFi signal with is LeeDroid A2SD+.
I've tried Oxygen, Redux and GingerVillain (all latest versions) but the Wifi often struggles to 2 bars never mind 3. With LeeDroid I get a pretty healthy signal all the time.
I now have S-Off and just updated to the latest Desire radio but I see no difference at all. Is there anything else anyone can suggest I try to get a better signal with any of the above ROM's, or suggest a ROM similar to the above that has a good wifi signal?

I would first make sure that the poor WiFi signal isn't caused by a hardware malfunction, inadequate placement of you router or improper firmware setup of it's parameters since you get poor signal with all roms despite changing the radio... have you tried connecting with some other wireless devices, was the signal any better? I had only once had bad reception and it was caused by a combination of underdeveloped/beta rom and in that time the newest radio... try changing the channel and/or wireless mode of your router...

You could also try Settings / Wireless & networks / Wi-Fi settings / Menu / Advanced and select the 'Best Wi-Fi performance' check box.

xybadog said:
I've tried a few different ROM's but the only one I get decent WiFi signal with is LeeDroid A2SD+.
I've tried Oxygen, Redux and GingerVillain (all latest versions) but the Wifi often struggles to 2 bars never mind 3. With LeeDroid I get a pretty healthy signal all the time.
I now have S-Off and just updated to the latest Desire radio but I see no difference at all. Is there anything else anyone can suggest I try to get a better signal with any of the above ROM's, or suggest a ROM similar to the above that has a good wifi signal?
Click to expand...
Click to collapse
Forget the bars in the display on various ROMs and check true signal strength via a program like WIFI Analyzer.
Sent from my Desire HD using XDA App

Thanks for all the feedback but:
@ser.clansman - I get this problem whichever wifi router/hotspot I use and not just my home network so it appears it's something to do with the ROM (I'm guessing) because it's fine with LeeDroid using different radios but not good with other ROM's.
@Parva4 - I've tried what you suggested but when I go into Advanced settings I don't have the "Best Wi-Fi Performance" option.
@Daz555 - I tried one yesterday, can't remember what it was called because I forgot to back it up before flashing my ROM back to Leedroid but it was showing a very poor signal. I think it was -60 (about 4 bars out of 10) and connection to the net was taking forever.
This is getting annoying now becasue it appears I can only use LeeDroid and, I guess, stock ROM. Any other suggestions would be very welcome.

Wifi is not that great on most Androids truthfully. There is a power limitation imposed due to battery life. Since battery technology is not quite where it needs to be to facilitate a consistently strong wifi signal, they downclock the wifis milliwatts giving a lower dbi. Whats your signal/range/objects in between?

piftoffpenguin said:
Wifi is not that great on most Androids truthfully. There is a power limitation imposed due to battery life. Since battery technology is not quite where it needs to be to facilitate a consistently strong wifi signal, they downclock the wifis milliwatts giving a lower dbi. Whats your signal/range/objects in between?
Click to expand...
Click to collapse
Where I work there is a public wifi and this morning, on 3 occasions I've been and stood about 4 metres away from the router, no obstructions and I'm getting, at best, 1 bar out of 3 (with Redux ROM). I asked for the router to be reset in case this was an issue but still got one bar max. I then reflashed LeeDroid and I'm getting 2 or 3 bars.

Right, I've tested the signal strengths with WifiAnalyzer whilst sitting in the exact same place (same distance and position from router) and tested one ROM then flashed 2 other ROMs and get the following results:
Leedroid = -65
Redux = -75
Oxygen = -75
This proves what I thought that Leedroid gets a better signal than the other 2.
Why could this be and what could I do to improve the signal on CM based ROM's?

I'm using the Leedroid HD V3.3.1 GB-R2 Rom and my phone's signal strength looks the best it's ever been, I'm not sure if that's down to the Rom or the Radio that I've recently flashed? Of course it could be that the wifi signal icon is exaggerating.
At the moment I'm sat about 2 feet from my router, I don't have Wireles N enabled on my phone, but I think it's enabled in the router itself. My Radio is 5.17.05.23
Wifi Analyzer my signal strength to be about -45 for my Home network.
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@UKseagull - Off topic but What did you use to get the screenshot of Wifianalyzer?

Here you go https://market.android.com/details?id=com.bw.picme.local&hl=en

Try Stock sense gb (hd port Rom) , WiFi works really good , also u have sense 3.0 and working 720p
Sent from my HTC Desire using XDA Premium App

sto0ka said:
Try Stock sense gb (hd port Rom) , WiFi works really good , also u have sense 3.0 and working 720p
Sent from my HTC Desire using XDA Premium App
Click to expand...
Click to collapse
Where can this ROM be found? I've looked on the "Everything Desire is here" thread and it doesn't appear to be on there.

Here it is :
forum.xda-developers.com/showthread.php?t=1151765
Sent from my HTC Desire using XDA Premium App

1x, even with roaming set to "Sprint Only"

Quite often my phone will switch to 1x while driving through the city. I set "Settings > Wireless and network > Roaming > Roaming mode" to Sprint Only in hopes that it would enforce 3G but it still occasionally jumps to 1x:
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Toggle the airplane mode and viola, 3G is back:
I got a cell phone amplifier with a cradle so why does it still switch to 1x even if I'm literally standing right under the cell tower? How do you force 3G-only? I'd rather get no signal than 1x, which will be nearly impossible inside the city with my setup
Thanks for the help!
EDIT: "Sprint Only" setting is for roaming only. To force 3G set "##DEBUG# > enter MSL > Others > HDR/1X Selection" to "EVDO only"... this will force 3G but also will stop SMS from being sent/received. seems like SMS are being sent over 1xRTT regardless what radio you're on.

According to your signature, you have a gsm galaxy s2?
If not, what modem are you running? I noticed lately that my phone would drop to 1x and not go back to 3g (I'm running the EL29 modem) . I got pissed and flashed the EL26 and it's behaving itself for now. 1x isn't necessarily roaming, that's, for a lack of a better term, 2g.

oscarthegrouch said:
According to your signature, you have a gsm galaxy s2?
If not, what modem are you running? I noticed lately that my phone would drop to 1x and not go back to 3g (I'm running the EL29 modem) . I got pissed and flashed the EL26 and it's behaving itself for now. 1x isn't necessarily roaming, that's, for a lack of a better term, 2g.
Click to expand...
Click to collapse
I always run same modem version as the kernel, EL29. Guess I'll give EL26 another shot
ps: CDMA SGS2, aka Sprint's Epic 4G Touch... thus me posting in this forum

1x doesn't only happen when roaming, so roaming settings won't help it
Sent from my SPH-D710 using Tapatalk

Whats weird about your problem is that I had the same issue at work constantly switching back and forth from 1x to 3g. Then my screen on that phone got cracked, got a new one through insurance. This new phone never goes to 1x at work, always on 3g. Also running blazer ROM that lets you know if your on 1x or 3g. So it led me to conclude no phone is built the same, and this phone must have a stronger signal somehow.
Sent from my SPH-D710 using Tapatalk

globen said:
no phone is built the same, and this phone must have a stronger signal somehow.
Click to expand...
Click to collapse
Could you do ##RTN# > View and post your PCB Version here? Mine is UnknownSMDK210.000c
Just wondering if there are different versions of this phone.

Wizard Knight said:
1x doesn't only happen when roaming, so roaming settings won't help it
Sent from my SPH-D710 using Tapatalk
Click to expand...
Click to collapse
That's what I thought too. From my experience setting it to Sprint Only actually did stop the phone from dropping to 1x so that led me to believe that they really were related.

There ya go
Sent from my SPH-D710 using Tapatalk

Just showing 1x does not indicate roaming, just means your phone is not connected to 3G bot to the slower 1xrtt Sprint network (for lack of a better word, 2G).
Showing 1x with a little triangle on the signal meter "indicates" roaming.

Sprint uses 1x for SMS(& secondary data), so if you want forced 3G only(there is a dialer menu that you can go to select that), you will not receive your SMS's, so just an FYI. But the reason you see 1x so often is because the radio on the Epic 4G Touch is crap, I've never seen a radio that has this many issues, random switching to 1x, data throughput issues, connection issues, etc(But then again, I've only had 1 Samsung before and it was for only 2 months)

^
said dialer menu is ##DEBUG# > enter MSL > Others > HDR/1X Selection
set to EVDO only mode.
I would leave it on automatic. Flash PRL 11115. You've tried updating data profile? you havent messed with roam control by any chance have you? if you id say maybe open the app and make sure you have it set to automatic in there as well. other than than.. perhaps theres been a bad flash along the way.. maybe do a lil odin reflashing back to stock and start fresh?

autoprime said:
^
Flash PRL 11115.
You've tried updating data profile?
you havent messed with roam control by any chance have you?
perhaps theres been a bad flash along the way.. maybe do a lil odin reflashing back to stock and start fresh?
Click to expand...
Click to collapse
yeah, last night i completely reflashed everything, ever went as far as formatting both internal and external sdcard. everything is now pretty much brand spankin new havent tried updating the data profile nor the prl. I'll flash 11115 / update profile and see how far that takes me. i'll give roam control a shot while at it as well.
thanks all for the feedback. agree with calkulin that this phone is mindblowing horrible when it comes to radios. even my old Touch Pro got better signal and better data... but then again, back then nobody used data for anything so sprint's data network was like a ghost town

I've been using 1115 and roam control for the past two weeks. This almost always means verizon in my area. I get better call reception but little, if any, improvement in data.

parkslope said:
I've been using 1115 and roam control for the past two weeks. This almost always means verizon in my area. I get better call reception but little, if any, improvement in data.
Click to expand...
Click to collapse
Not all areas get 3g roaming on 11115 ..... flash 00001 for a little and check your 3g speed then ..
Sent from my SPH-D710 using xda premium

T989 + Straight Talk + AT&T Sim = Intermittent Data? Help?

I have this phone unlocked and use it with Straight Talk.
I used it with a TMobile Sim and it all seemed to work fine (as expected)
I bought an AT&T Sim because I wanted to give it a try due to better AT&T Coverage.
Now the problem that I have is that the data is VERY inconsistent and unusable at times, even when it shows 3G and full signal bars.
Sometimes it will pull up web sites, sometimes it won't.
I can run a speed test and get 6mbit then a minute later it won't even pull up Facebook.
Any ideas as to why this is?
Could it be that even though this phone is compatible with AT&T bands that it just doesn't work well?
I used Straight Talks recommended AT&T APN settings which included a proxy, but with that I kept getting something about Proxy Authentication failed, so I read that I can remove the proxy settings, I did, and now data works but very up / down / on / off even though I have great signal and 3G icon is on.
Anyone using this phone with AT&T? Any issues?
Anyone using this phone with AT&T and Straight Talk? Any issues?
Any help would be appreciated!

I'm on att network and data works flawless le1 radio with the wap.Cingular apn settings, always get 6to8 down and 1 up speeds . I'm running aokp ics 7/15 although data has never failed on any rom .
Sent from AOKP greatness.

I encountered this problem. To correct it I downloaded the 'tweakker' app from Google play, deleted the current apn settings, ran the 'tweakker' configuration for straight talk, then rebooted. Data has been flawless since.
Sent from my SGH-T989 using xda app-developers app

I think the problem is that its sloe to switch back to HSDPA when it switches from umts. Sometimes I gotta toggle data on/off to get it working correctly. Any build.prop tweaks to keep it on Hspa?
Sent from my Galaxy Nexus using Tapatalk 2

I will try the Tweakker APP and see if that makes any difference.
It's just very annoying to have such intermittent data, especially when I am really trying to do something!

It does not work
wmblalock said:
I will try the Tweakker APP and see if that makes any difference.
It's just very annoying to have such intermittent data, especially when I am really trying to do something!
Click to expand...
Click to collapse
I am also using my T989(rooted,unlocked) with Straight Talk (AT&T). At the beginning, the data connection is good and that's why I switched from T-Mobile. Now, I got the exact same issue, the signal is very strong and shows "H" on the icon bar, but just cannot connect to internet. I didn't use much 3G data this month( about few hundred MB), so I don't think Straight Talk has blocked data.
I tried Tweakker for ICS Beta, but could not automatically configure the APN for my phone (ROM: AOKP Jelly Bean Build 1). I manually configured the APN per the instruction. Now I can do a Speed Test, but just cannot connect to internet - Chrome says invalid proxy. ...
Can anybody help? If I still cannot make it work, I might have to change it back to T-mobile although I really don't T-mobile.

I get excellent coverage and data with tmobile monthly 4G but it depends on your area, im using uvle radio with jedi mind trick v7
Here are my results:
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Sent From My Galaxia with The Jedi

Try Skyrocket roms
I had the same problem until I started using Skyrocket roms. Using Slim bean 2.6 now and consistently getting 3g speeds over 3mb/sec in a rural area where i hardly ever get more than 2 bars.

wmblalock said:
I have this phone unlocked and use it with Straight Talk.
I used it with a TMobile Sim and it all seemed to work fine (as expected)
I bought an AT&T Sim because I wanted to give it a try due to better AT&T Coverage.
Now the problem that I have is that the data is VERY inconsistent and unusable at times, even when it shows 3G and full signal bars.
Sometimes it will pull up web sites, sometimes it won't.
I can run a speed test and get 6mbit then a minute later it won't even pull up Facebook.
Any ideas as to why this is?
Could it be that even though this phone is compatible with AT&T bands that it just doesn't work well?
I used Straight Talks recommended AT&T APN settings which included a proxy, but with that I kept getting something about Proxy Authentication failed, so I read that I can remove the proxy settings, I did, and now data works but very up / down / on / off even though I have great signal and 3G icon is on.
Anyone using this phone with AT&T? Any issues?
Anyone using this phone with AT&T and Straight Talk? Any issues?
Any help would be appreciated!
Click to expand...
Click to collapse
I have Tmobile Samsung Galaxy S 2 T989 and just transfered to Straight Talk with a micro sim card put into a sim adapter to use on my cell phone ... however, I tried everything to get the data working but no luck at all .... it just shows bar for the signal with no data.
Calling and texting working fine.
What do you think guys? is it because the micro sim or what?

[Q] Tmobile Note 3 on ATT network?

Anyone else running a Tmobile Note 3 on the AT&T network? Is there any difference in reception or LTE? I've seen in other threads people complain that they dropped calls and had less reception with the Tmobile hardware on ATT, I'd be curious to see DB measurements and not simply rely on the reception bars. Also heard complaints that the Tmobile N3 doesn't hand onto ATT LTE signals well.
Also using the Tmobile Note 3 on the ATT network does;
1) does tethering still work?
2) does it work with an AT&T microcell?

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Tether Works
No problem here.
There are other thread with same information. Search.
Sent from my SM-N900T using Tapatalk

spinedoc said:
Anyone else running a Tmobile Note 3 on the AT&T network? Is there any difference in reception or LTE? I've seen in other threads people complain that they dropped calls and had less reception with the Tmobile hardware on ATT, I'd be curious to see DB measurements and not simply rely on the reception bars. Also heard complaints that the Tmobile N3 doesn't hand onto ATT LTE signals well.
Also using the Tmobile Note 3 on the ATT network does;
1) does tethering still work?
2) does it work with an AT&T microcell?
Click to expand...
Click to collapse
My wife and I both use straight talk which runs off of AT&T towers and when I'm at the house I have full bars and my speed was 20 if I remember correctly, at work I get 3-4 bars but never any reception problems. Hope this helps a Lil bit.

I'm running my N900T on AT&T with CM 11 and have noticed that my phone randomly drops back to Edge and even G sometimes. It has completely lost data access occasionally too. I put my phone in airplane mode and it goes back to full LTE, but that's bothering me. I don't know how to fix it.

Gaúcho comedor said:
I'm running my N900T on AT&T with CM 11 and have noticed that my phone randomly drops back to Edge and even G sometimes. It has completely lost data access occasionally too. I put my phone in airplane mode and it goes back to full LTE, but that's bothering me. I don't know how to fix it.
Click to expand...
Click to collapse
Mine does that on tmobile

Gaúcho comedor said:
I'm running my N900T on AT&T with CM 11 and have noticed that my phone randomly drops back to Edge and even G sometimes. It has completely lost data access occasionally too. I put my phone in airplane mode and it goes back to full LTE, but that's bothering me. I don't know how to fix it.
Click to expand...
Click to collapse
You can download Advanced Signal Status. Then go to additional info then device info and you can change the network mode to LTE only to force it to reconnect to LTE always.

sstory792 said:
You can download Advanced Signal Status. Then go to additional info then device info and you can change the network mode to LTE only to force it to reconnect to LTE always.
Click to expand...
Click to collapse
I tested the app here, and although it says my LTE signal is at 100%, my data connection is being disabled every time I make a call. I tried changing the preferred network type to LTE only in the phone info menu and calls drop as soon as I hit the call button on the dialer. Also, in the phone info menu, the option to enable/disable data shows only as "enable" during a call, which means data is disabled, and clicking it does nothing. As soon as I hang up, my data connection restarts and goes to 2G. I don't know if this is a problem with CM 11, so I'll try a Touchwiz ROM in a minute. Any other suggestions?

Gaúcho comedor said:
I tested the app here, and although it says my LTE signal is at 100%, my data connection is being disabled every time I make a call. I tried changing the preferred network type to LTE only in the phone info menu and calls drop as soon as I hit the call button on the dialer. Also, in the phone info menu, the option to enable/disable data shows only as "enable" during a call, which means data is disabled, and clicking it does nothing. As soon as I hang up, my data connection restarts and goes to 2G. I don't know if this is a problem with CM 11, so I'll try a Touchwiz ROM in a minute. Any other suggestions?
Click to expand...
Click to collapse
No problems at all with touchwiz. Probably a CM11 problem.

Question POCO F3 in the USA: Cell connectivity is inconsistent

Hi all,
I'm currently on Arrow OS but this seems to also affect other AOSP-based custom ROMs. I don't recall whether stock is affected.
Placing my Mint Mobile SIM into the POCO F3 works just fine; I can tell there's 4G and 5G, even if there's a slightly lower speed than on my Pixel 5. Keeping it in the F3 and moving out of a cell tower causes the signal to inconsistently drop; there are times when it will constantly connect and disconnect (with the exclamation point indicating no data). Other times it'll be rock stable.
My question is: Has any one else experienced this issue, and is there resolution for it? For me, it's a deal breaker because I need reliable data (even if it's not very fast).
PS: I heard that Pixel 6/Pro owners were experiencing the same thing, right down to the signal interruptions and slower speeds. I am also aware that some ROMs seem to mimic the 6/Pro in software; does this seem to relate?

On T-Mobile US, and this also happens to me. While my connection is stable at home, it gets unstable in an urban area or while driving. I heard that this caused by the modem crashing due to a bug in the firmware and that this only happens in North America. This issue used to cause the entire phone to crash and reboot, but the kernel in most AOSP ROMs was patched to restart the modem subsystem instead, which is why you'll lose reception for ~10-30 seconds. I don't actually remember if this happened on MIUI or not.
The only things that you can do about it is to either try switching to 3G only (which will only work for so long until T-Mo shuts down their old towers) or switch back to MIUI and see if the signal still drops. However unless Xiaomi releases a firmware update to fix the modem crashes (and who knows if they will at this point), I doubt that we'll see a fix for the signal drops.

I'm also having the same/similar issue quite often. I'm still completely stock, have been using the phone since late December on Tello in the US.
The service I believe runs on T-Mo towers and is in a rural area where I go in/out of service quite a bit and it seems to really mess with the radio/modem. It seems to constantly try to connect to 5G or 4G, whichever signal is stronger. This makes it constantly lose data connection, unless I go to the phone dialer and type *#*#4636#*#* and change the radios from NR/LTE/GSM/WCDMA to just NR/LTE. Then the connection is usually ROCK solid.
Only problem is the phone will default back to NR/LTE/GSM/WCDMA shortly after. Also, I often find that text messages and phone calls have stopped coming in and I have to turn on airplane mode for 10 seconds or so and then off to get the radio/modem to reset and reconnect to data.
Came on here hoping to see that someone had a fix for this issue baked into a ROM or something, but sounds like it's still an issue... :/
Was also going to research a new phone as well because it's finally driven me crazy enough to make a change, but sounds like f4 is the only decent thing out right now?

Drakhar said:
Was also going to research a new phone as well because it's finally driven me crazy enough to make a change, but sounds like f4 is the only decent thing out right now?
Click to expand...
Click to collapse
I'd be a little cautious about getting the F4, since it has the same Snapdragon 870 as the F3. If Xiaomi hasn't fixed the modem issue in the F3, who knows if they fixed it in the F4?

hhmm I have Tello here in the USA and never had the problems you guys have and have installed different roms back & forth Arrow then the EU weekly while under preferred networks I always choose LTE since 5G seems no faster north Chicago burbs area

jefffrom said:
hhmm I have Tello here in the USA and never had the problems you guys have and have installed different roms back & forth Arrow then the EU weekly while under preferred networks I always choose LTE since 5G seems no faster north Chicago burbs area
Click to expand...
Click to collapse
Thank you for this comment! I didn't even think to check the SIM settings for preferred network. Just switched it to LTE instead of 5G, now the radios are showing as (PRL) GSM/WCDMA/LTE.
Maybe this will fix my constant intermittent connection?

Drakhar said:
Thank you for this comment! I didn't even think to check the SIM settings for preferred network. Just switched it to LTE instead of 5G, now the radios are showing as (PRL) GSM/WCDMA/LTE.
Maybe this will fix my constant intermittent connection?
Click to expand...
Click to collapse
Let us know what happens!

hey buddy, i've been using f3 global variant for more than a year (vanilla Crdroid+microg) with T-mobile, i have nothing to complain about in urban areas, signal works 100% outdoor never lost signal but it happens inside buildings usually i notice when i'm on a call and go inside it will cause modem crash, i use osmand~ for navigation, all maps are pre downloaded into the phone so i don't really use data when travelling not sure if using google maps would cause modem crashes but i do stream videos or music and it does cut off due to weak coverage, i use a prepaid red mobile sim on att and it's excellent in rural areas, when it happens i turn off T-Mobile and redirect calls to the other sim, since coverage is way better on ATT when travelling cross country.

I'm in the US, on T-mobile, and have suffered from inconsistent mobile data as well. Some steps I took to resolve on this on A12:
- Use the latest EU firmware
- Flash Pixel Experience, format data, and reboot system (optional)
- Flash Evolution X, Gapps, Magisk
- Format Data and reboot system
- Enable roaming and wifi calling, and set the preferred network to LTE (I believe the F3 supports mot, if not all, of T-mobiles LTE bands while only supporting one 5G band)
- Try different Access Point Names. I'm using the US Mobile PWG APN
I'm connected to LTE+ with with 98.4 Mbps on the last speedtest after following these steps. I'm around my home now and TBD how well the service is when I travel away (service would become unusable if I was outside a 3-5 mile radius of my home).

I'm still bone stock. Haven't made any changes yet other than the preferred networked being changed to LTE now.
Still getting modem crashes frequently. Seems like it's always when I come and go from my house. I have absolutely zero service inside my home and I've got a weBoost Home Studio Omni setup which gives me service in the living room, but I still lose service often and I think this causes the crashes. I've been testing with the wifi calling turned off too because that has always been hit or miss as well too.

Drakhar said:
I'm still bone stock. Haven't made any changes yet other than the preferred networked being changed to LTE now.
Still getting modem crashes frequently. Seems like it's always when I come and go from my house. I have absolutely zero service inside my home and I've got a weBoost Home Studio Omni setup which gives me service in the living room, but I still lose service often and I think this causes the crashes. I've been testing with the wifi calling turned off too because that has always been hit or miss as well too.
Click to expand...
Click to collapse
Drakhar said:
I'm still bone stock. Haven't made any changes yet other than the preferred networked being changed to LTE now.
Still getting modem crashes frequently. Seems like it's always when I come and go from my house. I have absolutely zero service inside my home and I've got a weBoost Home Studio Omni setup which gives me service in the living room, but I still lose service often and I think this causes the crashes. I've been testing with the wifi calling turned off too because that has always been hit or miss as well too.
Click to expand...
Click to collapse
You do have the global variant correct?
MIUI V13.0.4.0.SKHMIXM some people buy the wrong ones , as stated I been usening Tello same tower's T-Mobile, and mint, works great apn
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jefffrom said:
You do have the global variant correct?
MIUI V13.0.4.0.SKHMIXM some people buy the wrong ones , as stated I been usening Tello same tower's T-Mobile, and mint, works great apn View attachment 5697591
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Yep, I have the same settings.
If I get some time today I think I'm going to try factory reset/clear data and flashing some new roms to see if it acts any different...

chr0nic_flashr said:
I'm in the US, on T-mobile, and have suffered from inconsistent mobile data as well. Some steps I took to resolve on this on A12:
- Use the latest EU firmware
- Flash Pixel Experience, format data, and reboot system (optional)
- Flash Evolution X, Gapps, Magisk
- Format Data and reboot system
- Enable roaming and wifi calling, and set the preferred network to LTE (I believe the F3 supports mot, if not all, of T-mobiles LTE bands while only supporting one 5G band)
- Try different Access Point Names. I'm using the US Mobile PWG APN
I'm connected to LTE+ with with 98.4 Mbps on the last speedtest after following these steps. I'm around my home now and TBD how well the service is when I travel away (service would become unusable if I was outside a 3-5 mile radius of my home).
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Likewise, I recently switched to the EU firmware from the Global and, contrary to what I thought, it actually works quite well! I haven't yet tested with this firmware situations where I lost data before, though. I'll update if the problem is improved or resolved.

Same problem, I have poco f3 global firmware and I try with eu firmware, same problem in both firmwares, I have AT&T and Telcel in Mexico, the problem is that the battery runs out and two lines drop, the problem is solved by putting 3g in telcel, with at&t i don't have this problem.

Nope, still there.

I'm sadly experiencing this issue in Canada running A13 custom ROM on my Poco F3. No solution in sight unfortunately.

Well, UPDATE: I switched to AT&T Prepaid in the USA and the cell connectivity issue is mostly resolved. As far as I can guess, Mint Mobile (and other MVNOs) seems to do something extra to the signal that the F3 does not like.

Same issue on Fido in Canada. The issue started more recently for me since MIUI 14. It is also around the same time Fido started to role out 5g which could be a hint as to why.

Same problem in Canada with Public Mobile for a year now. When switching tower or bands, modem crashes. Sometimes it recovers. sometimes not and I lose data and have to reboot phone...
see https://forum.xda-developers.com/t/modem-always-crashing-losing-voice-data.4581429/

As far as I can tell, both Fido and Public operate as MVNOs in Canada. If my guess is correct, your F3s are going to continue to encounter these issues unless you switch to one of the four major carriers (if they have the band support, of course).