All the unofficial roms' LTE single is unstable. WHY? - Xiaomi Redmi 3s Questions & Answers

I have tried plenty of roms here.They all have this problem.
And I'm sure it's not my phone's problem,cause LTE is very fine with Miui 7.3.11.
I tried *#*#4636#*#*.
When I used Miui,the LTE signal was stable at -101dBm 39asu or -102 dBm.The worst was -103dBm.
When I used other roms,the LTE signal sometimes got to -112dbm 255asu.

Related

Odd problem with only some ROM's and Radio.

I am currently own and use a T-Mobile S5, unlocked on the AT&T network.
I have installed several roms and I am having issues with the radio. Here is what I am getting, on most cases in some areas my phone is stuck on H+ and not LTE, but when I start moving around, LTE shows up (observation), other ROMS will show LTE almost all the time. The ROMS that show H+ a lot of the times, also seems to loose signal a lot. just go NO SERVICE for some reason, and then come back 30-60 seconds later?
I thought the modem was separate from the ROM, am I incorrect? is there a way to extract the good modem from the ROM, OR better yet, is there a depo for Modems that will work for this T-Mo phone?
so far the only ROM that seems to work correctly is Bliss pop? Any idea?
Thank you

Verry strange signal... Stock versus Aosp

I found a verry strange signal problem on my SM-N9005.
On stock rom or on custom rom based on stock my signal is verry poor.
On Cyanogen 12.1 signal is strong.
This using same modem.
For example: When I'm home on stock rom i have 1 maxim 2 bars of 3g signal and sometimes i have only 2g and not a chance to have 4g. On Cyanogen i have 3 bars 4g signal most of time or sometimes full 3g.
I have a friend that have same phone like me and he has stock rom. Sometimes he canot initiate call and I i have full signal with CM 12.1.
Can someone explain this? Why Stock rom has poor signal than Aosp using same modem?

Signal problem theory/research

Hello, i live in a relatively small town where my service provider has very poor 4G signal. but pretty good 3G signal. With the Axon 7 i have a lot of signal problems that i didnt have with any of my previous phones, where outdoor signal is pretty bad and indoor signal is almost unusable. It also connects almost exclusively to 4G, and in contrast all of my previous phones connected almost exclusively to 3G. Over the last weekend i traveled to a major city where my service provider has very strong 4G signal, and the signal problem was almost non existant. I even had signal in places where other people with the same service provider did not. So my theory is the following, assuming that the hardware (antenna) used for 4G and 3G is the same, it may not be a hardware problem, but a problem with the software having a hard time knowing which band/signal it should connect to. It seems that in my case it prioritizes 4G signal and the cost of a VERY unstable cellphone service. This is also assosiated with the fact that when it connects to 3G (incredibly rare), the phone goes inmediately from 1/2 bars to 4/5 bars. I also changed the SIM configuration to leave LTE out, but either for a visual bug or a software bug, it keeps connecting only to 4G. So could this be the problem that me and a lot of people in low 4G signal zones are having? Is there anyway i can force the phone to connect exclusivly to the 3G signal to test if that is indeed the problem?
Regards!
Nehuen said:
Hello, i live in a relatively small town where my service provider has very poor 4G signal. but pretty good 3G signal. With the Axon 7 i have a lot of signal problems that i didnt have with any of my previous phones, where outdoor signal is pretty bad and indoor signal is almost unusable. It also connects almost exclusively to 4G, and in contrast all of my previous phones connected almost exclusively to 3G. Over the last weekend i traveled to a major city where my service provider has very strong 4G signal, and the signal problem was almost non existant. I even had signal in places where other people with the same service provider did not. So my theory is the following, assuming that the hardware (antenna) used for 4G and 3G is the same, it may not be a hardware problem, but a problem with the software having a hard time knowing which band/signal it should connect to. It seems that in my case it prioritizes 4G signal and the cost of a VERY unstable cellphone service. This is also assosiated with the fact that when it connects to 3G (incredibly rare), the phone goes inmediately from 1/2 bars to 4/5 bars. I also changed the SIM configuration to leave LTE out, but either for a visual bug or a software bug, it keeps connecting only to 4G. So could this be the problem that me and a lot of people in low 4G signal zones are having? Is there anyway i can force the phone to connect exclusivly to the 3G signal to test if that is indeed the problem?
Regards!
Click to expand...
Click to collapse
Without knowing which model Axon 7 you are using, where you are using it, and who your provider is, there is little anyone can do to help you. All I can say is that it helped me A LOT to go into settings and turn off
VoLTE.
tabletalker7 said:
Without knowing which model Axon 7 you are using, where you are using it, and who your provider is, there is little anyone can do to help you. All I can say is that it helped me A LOT to go into settings and turn off
VoLTE.
Click to expand...
Click to collapse
U model last update, using it from Argentina, and the provider is Claro. I have LTE disabled in SIM confg as i already said and VoLTE turn of as well but the phone keeps connecting to 4G no matter what i do, even if i configure it to only GSM
I don't think its a matter of position or provider (version could be if different software is provided), but a general issue with the phone and band/signal interpretation coupled with the apparent innability to go off 4G
Refards!
Nehuen said:
U model last update, using it from Argentina, and the provider is Claro. I have LTE disabled in SIM confg as i already said and VoLTE turn of as well but the phone keeps connecting to 4G no matter what i do, even if i configure it to only GSM
I don't think its a matter of position or provider (version could be if different software is provided), but a general issue with the phone and band/signal interpretation coupled with the apparent innability to go off 4G
Refards!
Click to expand...
Click to collapse
ok when it connects to LTE it says "4G LTE". The 4G that you are getting is probably HSPA or something. And we had someone on here a few months back using Claro in Argentina and they had to seek answers from their Claro
tabletalker7 said:
ok when it connects to LTE it says "4G LTE". The 4G that you are getting is probably HSPA or something. And we had someone on here a few months back using Claro in Argentina and they had to seek answers from their Claro
Click to expand...
Click to collapse
If "4G LTE" is 4G and "4G" is HSPA, when only a "G" appears, what band am i connecting too? Its still pretty weird that im having major signal issues in my town, but when i go to a big city my signal is even better than other phones, it seems inconsistent with the whole "bad hardware" theory. I talked to Claro and it seemed like from their end it was a non issue, can you point me to the thread to see if he got it fixed somehow?
Regards!
Nehuen said:
If "4G LTE" is 4G and "4G" is HSPA, when only a "G" appears, what band am i connecting too? Its still pretty weird that im having major signal issues in my town, but when i go to a big city my signal is even better than other phones, it seems inconsistent with the whole "bad hardware" theory. I talked to Claro and it seemed like from their end it was a non issue, can you point me to the thread to see if he got it fixed somehow?
Regards!
Click to expand...
Click to collapse
/Trolling a bit/
I'm always LMAO when I hear US people talking about that 4G scam (which is H+ for real btw)
G is for 2G
E is for 2G+
3G is 3G
H is 3G+
H+ is 3G++ (an intermediary protocol up to 42MBps)
4G is LTE (up to 150Mbps in the EU most of the time)
4G+ is LTE-A (which is available in most of the EU, SK & JP) - up to 600Mbps, 200MBps in most tests
I've not heard of an app that could modify the way the phone "clings" to 4G LTE, since that might likely be the modem firmware doing it on its own.
RedWave31 said:
/Trolling a bit/
I'm always LMAO when I hear US people talking about that 4G scam (which is H+ for real btw)
G is for 2G
E is for 2G+
3G is 3G
H is 3G+
H+ is 3G++ (an intermediary protocol up to 42MBps)
4G is LTE (up to 150Mbps in the EU most of the time)
4G+ is LTE-A (which is available in most of the EU, SK & JP) - up to 600Mbps, 200MBps in most tests
I've not heard of an app that could modify the way the phone "clings" to 4G LTE, since that might likely be the modem firmware doing it on its own.
Click to expand...
Click to collapse
Then this is even weirder, because is G is not 3G, but 2G it means that the phone NEVER connects to the major band that all of my previous phones and Claro users connect to. Is there anyway to force to only connect to 3G?
Regards!
i have the G european model, in my town i have bad lte signal 1/2bar, when with my previously xiaomi mi4c was got 4/5 bars (maximum). In the big town i have got in the most of cases 4/5 bars. I think the "signal problems" are relatives of a lack of somehow software. i told this because i've read with the china model with the last updates an improvement of the signal reception of the phone.
Nehuen said:
Then this is even weirder, because is G is not 3G, but 2G it means that the phone NEVER connects to the major band that all of my previous phones and Claro users connect to. Is there anyway to force to only connect to 3G?
Regards!
Click to expand...
Click to collapse
You can however force a specific protocol indeed, but you will lack the ability to autoswitch networks. Just download 4G LTE Switch (here) which is a glorified secret code dialer. Just click on prefered network and change at your convenience (4G LTE only, WCDMA only - H+ - and so on). Remember that if you force 4G LTE in an area in which you have no coverage, you won't have internet, and no 2G/3G fallback (so no texts, no calls)
I don't know if this is the same problem, but my wife has an iPhone 6+ and I have an A2017U on B29 stock root. We both use the same network (Movistar Mexico) and while her iPhone often registers LTE, my A7 often registers 4G or even E in the same place. The A7 is receiving the same bands but appears to be "choosing" or locking into the slower protocols more often.
EDIT: NEVER MIND… an xposed module was messing with my network settings. Fixed it. Now I get LTE right away.
nuserame said:
EDIT: NEVER MIND… an xposed module was messing with my network settings. Fixed it. Now I get LTE right away.
Click to expand...
Click to collapse
Which module?
What if flash any Custom OS?Would it give better signal ?

Help me to force data only to 3G

Hi guys,
Recently bought a used(6 months) OnePlus 2 - 2003...I was really satisfied with the performance and huge 4gig ram. I use only a single sim, which has 4G. I used the sim with a Nexus 5 until the phone die, but I have never had any signal issue with that phone. In y country not every area has 4G coverage. I currently have Oreo resurrection remix rom, latest build. In my home town 3G, 4G coverage is at it's best and even on 3G coverage I got decent amount of speed with Nexus 5.
The problem is OnePlus 2 doesn't give the slightest speed that H+ is capable even while I'm on 4G. speed is about 500kbps max with 4G. If I chose WCDMA Preferred, from the service menu, it does show H+, but I can't surf on the internet. I'm very disappointed with this phone now. If I were to go to an area with no 4G, It won't get data connection turned on no matter what I do. I even flashed latest OOS 3.6.1 firmware but no luck. I went back to OOS 3.6.1 and it's the same, cant' switch to 3G data.
Man I don't know what to do now, I don't get wifi all the time when I'm away from home. Is there any way to disable 4G and just use H+ or 3G?
I even changed the band in service menu (*#*#4636*#*#)
Also flashed the latest lineage 15.1, CM 13 and no matter what I do
I also tried couple of other sim/ISPs but no luck
Please Help me
Use Network Signal Guru app(root needed). In app, select LTE band lock and deselect your LTE bands(depend on your carrier) use for 4g and exit. It will prevent your phone from connecting to LTE band. Enable the band again to get the LTE.

Not getting LTE

I have the global version in the UK.
Installed AOSP Extended gsi and everything is great apart from i never seem to get LTE coverage.
The best i do is H+. The apn settings for my carrier are correct.
What could be causing the issue and how do i fix it?
Try with *#*#4636#*#* and there you can choose Lte

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