LTE connectivity issues, "3107" 3G network - Verizon HTC One (M9)

Hi everyone,
My M9 has been having consistent issues with LTE connectivity. I'm rooted, s-off. The issue I'm having is that I regularly only connect to the 3G network, and my phone labels it simply as "3107". In the network list, I'm often connected to the Verizon Tracfone network, not the full vzwinternet network. If I manually switch these, it only lasts a short amount of time and LTE connectivity is weak. I've re-flashed a stock rom, same issue. New sim card even, same issue.
Any suggestions on how I can see exactly what bands are on/off and if my baseband firmware is out of date and/or broken - and if so - where I can get the latest version to try and fix it?
Thanks

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I flashed the leaked 4.0.3 radios for my Nexus, and noticed a good boost in signal strength. However, I have had several occurrences of not being able to switch back to CDMA signal. If I set is to CDMA only in the settings, I get no data connection. If I switch it back to CDMA/LTE, data will come back instantly. Also, while downloading a large file to my Mac, using WiFi Tether on the 4G network, I received a phone call. I expected my data connection to either disappear, or default to 1x, but instead, I maintained 4 bars of LTE signal, and my download continued at a fast speed throughout the duration of my 5+ minute phone call. I thought this was only possible with VoLTE, which Verizon hasn't launched yet? Any clarification on these matters would be greatly appreciated!
jyeley5 said:
I flashed the leaked 4.0.3 radios for my Nexus, and noticed a good boost in signal strength. However, I have had several occurrences of not being able to switch back to CDMA signal. If I set is to CDMA only in the settings, I get no data connection. If I switch it back to CDMA/LTE, data will come back instantly. Also, while downloading a large file to my Mac, using WiFi Tether on the 4G network, I received a phone call. I expected my data connection to either disappear, or default to 1x, but instead, I maintained 4 bars of LTE signal, and my download continued at a fast speed throughout the duration of my 5+ minute phone call. I thought this was only possible with VoLTE, which Verizon hasn't launched yet? Any clarification on these matters would be greatly appreciated!
Click to expand...
Click to collapse
You should be able to maintain LTE data and use voice at the same time, VoLTE or no VoLTE. In the non-VoLTE environment, the GN uses both CDMA and LTE radios concurrently and one doesn't impact the other. Only when using CDMA data will your data session be cut by a call.

[Q] HSPA -> LTE switching time

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I've noticed that when the phone detects an LTE signal, there's a noticeable period of no signal between dropping the HSPA signal and starting to use the LTE signal. Is this normal behaviour with your network? (It makes sense to me - the phone would need to switch radios, after all.)
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[Q] 3g and 4g problems

since i unlocked the phone i am having problems with my phone
It refuses to stay connected to 3g networks . it connects but after a while it disconnects and doesn't connect again only( if i reboot the phone it does but drops again)
Forcing WCDMA only doesnt fix it , if i choose GSM/ WCDMA it reconnects to gsm
If i pick LTE signal i can do everything but receiving calls it says its turned off
I tried:
Installing stock firmware ( currently 4.4.2 DTM unbranded) and other custom firmware
Getting new sim card and changing carrier ( its not a carrier issue)
All Apn settings are fine
please advise
ok 4g according to info i saw i cant receive calls , however i want it to stick with 3g witch due to my problem has been impossible
signal bar drops after being full and ban no signal
Anyone?
Signal Drops == not fully compatible modem
Installed cyanogemmod and the issue is gonne used all day no issues

[Q] N900T: fixes for poor signal?

My N900T has much worse signal than my previous Note II - between 15 and 20 dBm worse, so essentially unusable out in the fringe area I live in.
I'm running SlimKat 9.0 (4.4.4) baseband is N900T UVUENK3 (which I think might be the most recent modem).
I'm using a StraightTalk ATT SIM (phone is unlocked) but that shouldn't matter for signal strength
I've got Preferred network type: LTE
And in service mode / phone info, I have preferred network type: LTE/GSM auto (PRL) - unchanged from standard.
I've removed the back cover (the one under the battery door) and made sure all the "fingers" make good contact with the contact pads that are built into that cover (fixed my GPS but not baseband)
Anything else I can check? Should I try some ATT radios to see if signal improves?
Or is this just the nature of the beast? Move to the city or get a different phone?
Thanks for any input!
Had this problem but hopefully the fix I used will work better. I flashed pac rom from nightly and resulted in no signal even though showed 3 bars(never higher or lower) but no connection in reality. Tried this and got signal kinda ( very slow and missed calls and sms)
Anyway
On tmobile network but might help either way idk never had att.
First goto
Settings/More Networks/...
Then first try the lte if not heard using 3g can fix signal connection with custom roms.
Check your apn settings and verify with att/simple talk
And if needed hit the mobile operators and let it do its thing.
Still not working can try fixing another way let me know.
Screens attached and can't post link ig but quick Google search should net you the setting. I did keywords "att apn settings"
Let me know how it goes. Flashing pac rom see how update goes this time for me lol
The signal got a good bit better when I replaced the antenna signal cable. Cost a whole $3.
I'm still 5 or 6 dBi down from my old note 2, but, from my forum reading, that might be the nature of this beast.
I have same problem, poor network, and sometimes when I go to some club or cafe I dont have network and on S2 same network I have full signal 3G, H+

LG G3 D855 Odd behaviour when roaming

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I have a Three (UK) SIM, and have recently been in California, where I observed some odd behaviour. I'd be glad if anyone is able to comment or explain any of this!
1) I never saw any 4G (LTE) connections. From other posts in this forum it does appear that this model of G3 may be incompatible with T-Mobile US and AT&T network frequencies, and if so that's understandable.
2) It seemed to have a very strong preference to connect to T-MO, but on that network it would frequently lose data connectivity, despite the phone showing a strong signal. My wife's Galaxy S3, also on Three, would stay connected all the time. If I tried manually searching for networks and selecting either T-MO or AT&T, usually that would restore connectivity. However...
3) Entering manual network selection from this state (connected to T-MO but not getting any data), the phone would display a warning along the lines of "Do you want to search for networks while there is an active data connection?" -- yet there was no data connection icon in the status bar, and no throughput. This feels like some sort of bug - the phone thought it had a data connection but really didn't?
3) Even though I would manually select the AT&T network, and get some throughput, the phone would fairly soon spontaneously reconnect to T-MO, and shortly afterwards again lose data connectivity. This became tedious and frustrating. Other phones I've had have always respected a manual network selection and stuck to the selected network, even when if another available network had a stronger signal. Not so this G3. Is this known, normal behaviour?
The only other thing that may be relevant is that for most of the time I had the phone set to connect only to WCDMA networks, because the data capability of GSM is next to useless, and since I'd not seen any LTE, and WCDMA + LTE only is not an option, WCDMA was really all I was interested in.

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