Database Users

HELP | Unable to use Cingular UMTS network in the Washington DC area

Guys
I am trying to setup my new TyTN to use Cingular 3G/UMTS .. but for some reason .. it doesnt work .. which is a really breaking my heart because as per the 3G coverage map from Cingular my area (Dulles airport/Reston) has 3G coverage.
The details/settings are:
Device: Stock TyTN, HERM200, HT636 series
SIM: around 2 years old, 64K SIM (no 3G indications on it though)
ROMs: Original HTC ROM (07/22), 1.16 RadioROM (Updated)
Bands: Auto, Auto
After soft-resetting with these settings, when the device comes back up, it shows the fabled "U", but then immediately the signal drops to zero and I am not able use voice or data.
TyTN only works when I set it to GSM, GSM (1900+850) + UMTS(1900+850) band settings, which gets me on the GMS network and gives me Edge speeds only (~130-140K). The signal strength is pretty good (3 to 4 bars)
Any thoughts regarding what might be going?
Thanks in advance for the help!!

I thought that you needed a 3g sim card? I could be wrong but i thought i seen that somewhere.

If you do get it working I would love to know how it works. Im doing alot of reading on the Herms as it will be the wifes Christmas present.

My TyTN to worked just fine during a recent trip in your exact area. Try this:
Drive to Dulles Airport itself and check if you get 3G inside. 3G coverage was excellent there but got spotty for me a mere 5 miles away at the Dulles Airport Hilton.
If you don't get coverage inside the Airport, go to a Cingular store and request a 3G SIM upgrade. They say "3G" right on the back.

:O I thought I had a 3G sim, but I have a regular 64k sim! I now have to go to my local store to pick one up!

Hey guys....I live in Northern VA and just got a TyTn last week. I setup my GPRS connection using the Cingular settings and left the bands on Auto. I get excellent 3G reception (before and after 1.20 radio upgrade). You probably need to go get a 3G sim card I guess. I thought my card wasn't 3G but when I checked closely it indeed was. Just out of curiousity I called my local corp store and they told me you can just go in and they'll give you a new card.

Right, there's not supposed to be a charge but my local Cingular store fleeced me for $20...
Had I known then what I know now I'd have questioned it...

What do you know now? I don't wanna pay $20 for that! lol

That Cingular does these for free. I'd ask "ummm... how come you charge $20 for something your company authorizes you to do for n/c?"

Well it was the SIM card!! The guys at the store charged me 25$ for a new SIM ...
but ITSSSSSSSS WORKINGGGGGGGGGGG now ... WHOHhhhhhhhhhohhhhhhh
getting over 900kbps on my TyTN !!! Thanks Sleuth!! YOU ROCK!!!!......

jeez.... those fleecing bast!rds.... must be lining their own pockets with it too....
For those of you who are unsure what a 3G sim looks like, here's a pic of the back of one:
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the key difference is the "3Gc" notation.
took this pic with my TyTN btw

LOL so I went to the store to get one, and they gave me one no questions asked, and even for free; but I found out I actually HAD a 3G sim already, lol. Oh well, at least I have a spare

Sleuth255 said:
jeez.... those fleecing bast!rds.... must be lining their own pockets with it too....
For those of you who are unsure what a 3G sim looks like, here's a pic of the back of one:
the key difference is the "3Gc" notation.
took this pic with my TyTN btw
Click to expand...
Click to collapse
yeah ... looks like the new one that I got...

What does the 3G card do for you? I get really good data speeds using a 2G SIM, and I am curious why I would need to update...
Would it happen to help with the problem I've been having transitioning between GSM and UTMS? Possibly? Please?

It certainly can't hurt to try. My Cingular rep told me that I wouldn't even be able to get a UMTS signal on Cingular's network without one. In Gravejoker's case this appears to be a case in point.

There's NEW Cingular 3G sims out now! With their firey 3G ball and all. Also apparently adds support for Video Calling, once enabled

Sleuth255 said:
It certainly can't hurt to try. My Cingular rep told me that I wouldn't even be able to get a UMTS signal on Cingular's network without one. In Gravejoker's case this appears to be a case in point.
Click to expand...
Click to collapse
No, I definately get UTMS on a 2G SIM. 700 - 900 kbps, to give you an idea of my data speeds. I also like the fact that I continue to receive emails when talking on the phone. I just wish the battery life was better when using UTMS; I often get 6 - 8 hours before it starts complaining about low battery. (Good thing I have a car charger and carry a sync cable in my notebook case!)

darkjedi said:
LOL so I went to the store to get one, and they gave me one no questions asked, and even for free; but I found out I actually HAD a 3G sim already, lol. Oh well, at least I have a spare
Click to expand...
Click to collapse
Maybe that's my case... Hmm...

Sleuth -
I have an old Cingular 8125 64K SIM card and consistently get 700+ Kbits per sec on U in the Washington DC Area. Never had a problem with U throttling down to G very frequently.
My Dopod 838Pro is configured for cell GPRS,3G. Aren't these speeds (from dslreports.com mobile speed test) typical of 3G?
Will I notice a big difference swapping in a "3G" SIM?
I'll try this out tomorrow and report the results.

Just look at your SIM card, if you have the 3Gc on the back of it, it's a 3G sim. The front says Cingular 64k SIM; which is why I thought I had an older one. Their newer SIMs actually have 3G on the front and all all blue . Less confusion that way I think.

a "U" where the "G" used to be

K ya know beside the signal bar it shows a "G" then if you click on it it asks if you want to turn on wireless, well now there is a "U".
Is there someplace that can tell me what all these symbols mean?

Wow.... seriously... where do you live?
The U means that you now are connected to UMTS which gives you the "broadband" access through your provider. Make sure you have unlim data plan. It will start to eat it up when you realize what you get to do with all that bandwidth. Have FUN!!!

well does it eat up data if you "dont" use messenger or web browse? AKA: just use the phone?
I do have a data plan for unlimited text messaging and i use Wifi when i wanna surf.

Quick guide:
Starting with the slowest.
Second Generation:
GSM
GPRS (the G symbol)
EDGE (the E symbol)
Third Generation:
UMTS (the U symbol or depending on localisation, 3G symbol)
HSDPA (the H symbol, if you've got this, then you're in for some fast download speeds)
It all depends on which network you're on and proximity to a tower as to what speed you will actually get.
There are other types, but these are the ones you're more likely to come across using a Hermes.

U Bet
ROTFLMAO.... I thought I had a bug in my ROM after flashing it, even went to the trouble of rolling back.
What a freakin' idiot I am!....

I live in an area where i see U and H fairly often up there.
However, to me it makes little difference, I don't download large files with the device. Web browsing seems mostly unaffected by the connection type.

Having the device in 3G or 3.5G modes does however drain the battery somewhat faster. I saw the difference in my Uni. Can't comment on EDGE as the Uni doesn't have it, I'll be getting my Hermes today so I should be able to comment on that.

It would be logical that the faster connection speeds would drain the battery faster, but I don't know how much faster we're talking about.
However, if battery life is a concern at all for anyone reading this, I would recommend turning off 3G altogether. Why? Web pages are going to render just as fast. Surfing the web is painful on these things regardless of the connection type.

On T-Mobile at least - here is a rough guide for the download speeds for different connection types. These are averages and do change and vary with signal strength. I work for T-Mobile, so these are accurate ^^
GPRS - around 44 kbps
UTMS (3G) - around 386 kbps
HSDPA (3.5G) - up to 1.8 mbps (increasing to 3.6 soon)
If you are on T-Mobile, and in a 3G area, then you will be most likely connected to HSDPA as it covers the whole of their 3G network.
Hope this is of some interest....

Doom Tints said:
if battery life is a concern at all for anyone reading this, I would recommend turning off 3G altogether.
Click to expand...
Click to collapse
But how? AFAIK it's not trivial with my unit: http://forum.xda-developers.com/showthread.php?t=337485.

From your network type, select 'GSM' instead of 'Auto', which I'm sure it is on now. That will do the trick. You might see an 'E' if you service provider offers EDGE, but this won't be an issue, otherwise you will just see the 'G' again.

Thank you. Now I know that in this sense, WCDMA = UMTS = "3G" icon.

Doom Tints said:
From your network type, select 'GSM' instead of 'Auto', which I'm sure it is on now. That will do the trick. You might see an 'E' if you service provider offers EDGE, but this won't be an issue, otherwise you will just see the 'G' again.
Click to expand...
Click to collapse
That looks notoriously like one of my posts earlier in another thread
http://forum.xda-developers.com/showthread.php?t=337485

Yeah. Someone said OH MY I HOW DO I DO THIS IT'S HARD OMG and then pasted a link to your thread, which says clearly how to do it.
A simple cut and paste seemed in order.

Radio Access Technologies
Hmmm...u poor guys..in Austria the speeds are different:
HSDPA : 7,2 MB (yep MegaBits) DL and 1,7 Mbits UL
BTW: HSDPA is not 3.5G its just a bunch of new coding schemes and NodeB software mods :.)

homerjay1981 said:
Hmmm...u poor guys..in Austria the speeds are different:
HSDPA : 7,2 MB (yep MegaBits) DL and 1,7 Mbits UL
BTW: HSDPA is not 3.5G its just a bunch of new coding schemes and NodeB software mods :.)
Click to expand...
Click to collapse
T-Mobile UK will have these speeds by the end of 2008 all going well

Well my phone bill is the same so thats good
Text messages get sent a tiny bit faster, surfing is a bit faster. I dont see what the big deal about the HW upgrade was. oh well

HSDPA not working on t-mobile in the UK?

I have a TD2 and over the last few days I have had no Internet access/data connection over HSDPA on T-Mobile in the UK. This includes weather tab updates/youtube app/Opera/Microsoft MyPhone etc. When using GPRS and WiFi there are no problems. I have enough signal so I am at a loss. I have also performed a hard reset to no avail.
Can anybody state whether they are able to connect to data via HSDPA on T-Mobile in the UK?
Many thanks
Tony

Working fine here and getting damn good speeds actually(260k/s). Try unticking 'use proxy server' in connection settings.

Working ok for me yesterday, uploaded photos to Facebook no probs. Though I continually get error dialogs when moving from a 3G to non-3G area. As I live in a non-3G area I am thinking of disabling it for now.

bambony said:
I have a TD2 and over the last few days I have had no Internet access/data connection over HSDPA on T-Mobile in the UK. This includes weather tab updates/youtube app/Opera/Microsoft MyPhone etc. When using GPRS and WiFi there are no problems. I have enough signal so I am at a loss. I have also performed a hard reset to no avail.
Can anybody state whether they are able to connect to data via HSDPA on T-Mobile in the UK?
Many thanks
Tony
Click to expand...
Click to collapse
No problems. I wish I got the speed mentioned by englefield though
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Is your problem just in one location? I've had days where 3G didn't work at all in a particular location, next day it was fixed. I believe t-mobile is rolling out a program of combined cell towers and equipment with 3 Network, so certain cells become unavailable for a while.
I've also had the problem where "H" shows with good signal strength, yet unable to get internet connectivity through the cell, due to a network problem.
To be frank, in the 2-3 months I've been on t-mobile I've seen a marked deterioration in service such as poor speeds and cells unwilling to handoff data connections. I think too many people have been signed up

I've actually left T-Mobile after being with them (one2one) for over 15years. 3G speeds really inferior to o2. Had friends o2 sim in my TD2 and got 500k, on T-Mobile 50k to 157k (If I'm lucky)
lilHermit

Pete_S said:
Is your problem just in one location? I've had days where 3G didn't work at all in a particular location, next day it was fixed. I believe t-mobile is rolling out a program of combined cell towers and equipment with 3 Network, so certain cells become unavailable for a while.
I've also had the problem where "H" shows with good signal strength, yet unable to get internet connectivity through the cell, due to a network problem.
Click to expand...
Click to collapse
It's most likely that you are right with this info particularly paragraph 2. Hopefully things will improve
Many thanks for your and everyone else's replies
Tony

T-mobile is currently inergrating its 3G HSDPA network with 3s so speeds should be better by the end of the year..
they are predicting speeds of 4.5mbps by the end of the year.

jonathanfoster said:
T-mobile is currently inergrating its 3G HSDPA network with 3s so speeds should be better by the end of the year..
they are predicting speeds of 4.5mbps by the end of the year.
Click to expand...
Click to collapse
Thanks for the news
Hoping it works well as I don't get much joy most of the time with the 3G service thus far.
Tony

jonathanfoster said:
T-mobile is currently inergrating its 3G HSDPA network with 3s so speeds should be better by the end of the year..
they are predicting speeds of 4.5mbps by the end of the year.
Click to expand...
Click to collapse
The integration is not quite as much as you might expect. The plan was just to share masts, using separate t-mobile and 3 antennas, and probably linking into a shared feed to their respective routing centres, or whatever they're called.
It seems to be more "infrastructure sharing" rather than merging. Obviously, if there is a 3 mast in what is now a poor t-mobile reception area you would get a better signal with a new t-mobile antenna on that mast.
But I wouldn't hold your breath, you've probably heard the news in the last day or so that t-mobile will shortly be merged with orange
http://news.bbc.co.uk/1/hi/business/8243226.stm, so I really can't see the t-mobile - 3 collaboration going much further than what's been done already.
I noted from details of this new merger: "Integrating the businesses would cost between £600m and £800m, the firms said. This bill would include decommissioning mobile phone masts"
So, that's the same number of users and fewer masts. Hmm...

englefield said:
Working fine here and getting damn good speeds actually(260k/s). Try unticking 'use proxy server' in connection settings.
Click to expand...
Click to collapse
260kbs! that is shockingly slow for hspda

Slow ? Thats over 2 megabit/s - some people done even get that on their landline broadband. Of course it go faster but is going to be limited at the network end. Two meg is more than enough for me out and about though!
tom

edoftech said:
260kbs! that is shockingly slow for hspda
Click to expand...
Click to collapse
You must be living right by a mast in a quiet area
Come to London and sample 50 - 100kbps. Sometimes I can barely stream a 32kbps internet radio feed.
* I am talking bits/s, not byte/s

MI Note 2 Users - Please test and confirm WIFI/4G/bands

Hey guys,
As this is a new release, I am keeping an eye out for tests of the stability and reliability of 4G LTE connections (the reception) and also the same for connecting over ac WIFI. Can someone please post some tests/videos/results?
Second. can someone also take a picture confirming ALL 4G LTE FDD bands supported. GSMArena and PDAdb.net both state this supports Bankd 29 700Mhz. is this correct?
Thanks
RoOSTA

roosta said:
Hey guys,
As this is a new release, I am keeping an eye out for tests of the stability and reliability of 4G LTE connections (the reception) and also the same for connecting over ac WIFI. Can someone please post some tests/videos/results?
Second. can someone also take a picture confirming ALL 4G LTE FDD bands supported. GSMArena and PDAdb.net both state this supports Bankd 29 700Mhz. is this correct?
Thanks
RoOSTA
Click to expand...
Click to collapse
I have the CN edition rather than the global so I wouldn't expect to have Band 29 so I can't help you there.
In terms of general stability and signal quality with LTE connections.
They're very good.
I'm not sure what kind of test/video or result you'd want to see as it seems like there are always too many variables to get consistent test results, I can quite happily get 70mbps down on LTE using band 3.
As for WiFi - I'm hoping this is a ROM issue more than anything else, I'm unable to set my locale so I don't which nations wifi regulations I'm following (I'm using mi-globe.com as there isn't currently a global release rom).
I max out with a link speed of 433mbps on 5GHz (desktop achieves 1300mbps) and can't achieve more than a stated link of higher than 150mbps on 2.4GHz (desktop achieves 600mbps)
although the range is very good, and the eventual handoff to LTE is very quick too.
Is there something specific you're looking for I can help with?

StoneTrapper said:
Is there something specific you're looking for I can help with?
Click to expand...
Click to collapse
Thanks for that. Yes, I think there is. Maybe see if you can set LTE only, or LTE/3G (etc)...do you get full reception at work, or in your home? Maybe just monitor it's strength without moving the phone from a typical "full strength location" and see if it changes. You can also run other apps that will utilise more of the CPU and RAM 9not necessarily internet-demanding apps) to see if they are a factor, in any way, on the radio strength.
I am mostly interested in the global version, what ROM it is (hoping different rather than just the CN with extra languages). As it's important to see what bands are supported, usually mentioned on the package... I also need to see the functionality of the dual sim and how the 2 interact when a data connection is active and a call comes in on the other SIM, etc. Screenshots confirming the SIM's connection sin the upper right status bar would also be benefical.
Thanks

roosta said:
Thanks for that. Yes, I think there is. Maybe see if you can set LTE only, or LTE/3G (etc)...do you get full reception at work, or in your home? Maybe just monitor it's strength without moving the phone from a typical "full strength location" and see if it changes. You can also run other apps that will utilise more of the CPU and RAM 9not necessarily internet-demanding apps) to see if they are a factor, in any way, on the radio strength.
I am mostly interested in the global version, what ROM it is (hoping different rather than just the CN with extra languages). As it's important to see what bands are supported, usually mentioned on the package... I also need to see the functionality of the dual sim and how the 2 interact when a data connection is active and a call comes in on the other SIM, etc. Screenshots confirming the SIM's connection sin the upper right status bar would also be benefical.
Thanks
Click to expand...
Click to collapse
Set to LTE only I get full signal at home and I haven't noticed anywhere in the city I don't have 4G, (at least while above ground).
It's not easy to make too much of a dent with that amount of RAM but CPU increased utilisation has no affect. I tend to keep my signal details as numerical anyway, that changed today when I flashed a statusbar mod changing my clock position so it's not in my screenshots.
You won't be seeing a difference in the ROM with global version, there isn't any reason to think they're releasing a separate ROM for the global version. The ROM that's out now is for all versions, I've taken it apart and the support in the current ROM is there for all the bands. I haven't worked out where they're limiting the bands but I've had a tinker. Changes to NVRAM values are lost on reboot and I haven't got any real reason to play other than curiosity.
If they release the phone internationally that would be when they release a global ROM; the differences there are localisations, removal of Chinese local apps (baidu, etc) and inclusion of google apps instead but nothing much more substantial than that. Was there something in particular you were hoping for?
No problems running data on one sim and receiving a call on the other, I tried this a few times downloading on LTE and calling myself via Skype (to my number not Skype -> i.e not local cell or data call). 10 out of 10 times there was no problem receiving the call and no noticeable impact on data speeds at the time.
Not sure how I show you with screenshots that one sim is active for data while another is active for voice, there's no indication when a sim is being used besides for data but I've taken some running an LTE network scanner. It'll only show networks on the band I'm currently active on (no idea why). Searching for available networks to join I can see LTE networks that use must band 7 (I assume, since that carrier has bands 7 & 20 - and well I shouldn't pick up band 20)
Hopefully you can gleam something useful from some of these screenshots, these were taking live as it was running. Since it's just network scanning here's no actual data flow hence why you see there's no data activity in the statusbar.
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@StoneTrapper How do you find and rate the UI?
I've heard there's a few who don't like it and want to switch phones because of it.
I can see 4g/3g from your screens, so I wouldn't think using 4g and taking a call over3g frequency would be an issue given the CPU in this. THe lack of Band 28 (or many other bands for that matter) is a bit concerning
RoOSTA

roosta said:
@StoneTrapper How do you find and rate the UI?
I've heard there's a few who don't like it and want to switch phones because of it.
I can see 4g/3g from your screens, so I wouldn't think using 4g and taking a call over3g frequency would be an issue given the CPU in this. THe lack of Band 28 (or many other bands for that matter) is a bit concerning
RoOSTA
Click to expand...
Click to collapse
I'm used to MIUI, it's not my first xiaomi phone. I don't mind it, it's not ideal but there's nothing really unlikable about it.
People will always have their own preferences with roms, sooner or later xiaomi usually release the source code and the custom roms come flooding.
Yeah one of the networks I'm with only offer 3g, otherwise it supports dual LTE. If you want additional bands they offer a global edition that supports:
B1, B2, B3,B4, B5, B7, B8, B12, B13,B17, B18, B19, B20, B25,B26, B28, B29, B30
TD-LTE: B38, B39, B40, B41
I don't need the additional bands and the CN edition is already available to I went ahead and got that.

Redmi 3s network issue

Hi guys,
I have been facing really bad network issue for redmi 3s prime.. Basically there is alot of people facing this issue.. The problem is when network drop to 2g it will not revert back to 3g or 4g.. One of the facing issue sometimes when i drop it will go to IWLAN..
The workaround tips is we use 2 sims and sacrifice our sd card..which some of us dowan to..one other tip is to open gps and open google maps and let it run on background..which will drain our battery..
Some of the user said it is kernel issue, some rom issue and some said it is hardware issue..
I hope someone here will help to sort this problem..
Thanks and best regards..

My redmi 3s network is also week

same problem here! 3s Prime international

Yeah, I'm facing also quite poor battery life due to this continuous network search / reconnecting problem. The workarounds mentioned above, using 2nd sim slot makes a difference? Don't get the tip with maps... With active GPS the reconnect 2G - 4G e.g. Works? But GPS is a known bug by (most/all) cm based roms? I really hope the official kernel source will fix it. I'm using the international version of the phone as well, with b20 lte (as long as it's connected to it )

mallok said:
Yeah, I'm facing also quite poor battery life due to this continuous network search / reconnecting problem. The workarounds mentioned above, using 2nd sim slot makes a difference? Don't get the tip with maps... With active GPS the reconnect 2G - 4G e.g. Works? But GPS is a known bug by (most/all) cm based roms? I really hope the official kernel source will fix it. I'm using the international version of the phone as well, with b20 lte (as long as it's connected to it )
Click to expand...
Click to collapse
I have tried:
- Second SIM - did not fix it, seems to work for a short period, but was down to 2G again.
- GPS - sometimes works other times no.
Issue isn't with 4G for me, only with 3G. my phone will only connect to 4G and if it drops off 4G goes straight to 2G even with full 3G reception. I have only seen it connected to 3G on the odd occasion.
Kernel source is not likely to fix it. Only fix (if software) has to be the modem firmware I think.

I had a similar problem with 3s prime purchased from India. Turns out that the network problem is caused by the lack of bands in the phone. Eg. My network runs on the 850 Mhz and 2100 Mhz but phone had 900 and 2100Mhz. so when there is a variation in the network bands I used to get call drops and no network. Even I phone used to get 2 bars in the remote area but I had no service.
There are so many versions of the phone out there. you need to be careful which one you choose. If you have network problems, my money is on the lack of bands in the hardware.
I have these right now compared to 4G: FDD LTE B1/3/7/8/20(2100/ 1800/ 2600/ 900/ 800MHz), TD-LTE B40(2300MHZ) TD-LTE 2300(band 40) FD-LTE 1800(band 3) / 850(band 5)
3G WCDMA 850/900/1900/2100MHz UMTS 2100 / 900 MHz
2G GSM 850/900/1800/1900MHz GSM 1800 / 900 MHz.
Although some models are "international version" they may not have all the bands. I cant find the links now as I already got my phone 2 weeks ago but I know for sure that I have looked at many international versions not having all the bands.

hello, i had that issue until i disabled B8 GSM 900 band wcdma.
use "Network Signal Guru" to do it. Root is required.
here's a screenshot of what have i disabled.
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Jure_aleksic said:
hello, i had that issue until i disabled B8 GSM 900 band wcdma.
use "Network Signal Guru" to do it. Root is required.
here's a screenshot of what have i disabled.
Click to expand...
Click to collapse
If i did this I will never have 3G as my network uses the B8 900 WCDMA band.

Honorzzz said:
Hi guys,
I have been facing really bad network issue for redmi 3s prime.. Basically there is alot of people facing this issue.. The problem is when network drop to 2g it will not revert back to 3g or 4g.. One of the facing issue sometimes when i drop it will go to IWLAN..
The workaround tips is we use 2 sims and sacrifice our sd card..which some of us dowan to..one other tip is to open gps and open google maps and let it run on background..which will drain our battery..
Some of the user said it is kernel issue, some rom issue and some said it is hardware issue..
I hope someone here will help to sort this problem..
Thanks and best regards..
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Click to collapse
This is not the category to post Q&A or general queries. Remove this thread.

syl0n said:
If i did this I will never have 3G as my network uses the B8 900 WCDMA band.
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My operator uses 900 mhz and 2100 mhz
My phone has never, ever connected to 900 mhz band
Your operator must use two bands atleast for one connection
Try to disable it, its very easy to undo the process
Feedback me with results. Regards

Jure_aleksic said:
My operator uses 900 mhz and 2100 mhz
My phone has never, ever connected to 900 mhz band
Your operator must use two bands atleast for one connection
Try to disable it, its very easy to undo the process
Feedback me with results. Regards
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I disabled 2100 band instead of 900 and testing now. So far i haven't dropped to edge but lets see if it lasts.

syl0n said:
I disabled 2100 band instead of 900 and testing now. So far i haven't dropped to edge but lets see if it lasts.
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I turned off 2100 band WCDMA and began to operate normally (except data in the lte)

hacel said:
I turned off 2100 band WCDMA and began to operate normally (except data in the lte)
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Exactly the same in my case. I disabled the 2100 and it is working better. But also I still dont have any 4G network

I encounter the same problem ! Disabling all the LTE band and 3G band and leaving only the B20 LTE band and 2G band make the phone works properly in 4G.
(My Carrier is Bouygues Telecom in France. It uses the B3 and B20 band for the LTE)
This is really usefull as the phone was really so unstable i coulnd't use it normally to call or receive calls neither receiving or sending sms !
With this trick, at last i can use my phone.