After root the 4G not working properly - G4 Q&A, Help & Troubleshooting

I rooted by h815 international locked on Vodafone UK, after the root the signal sometimes completey cuts, other times phone calls won't come through, all when on 4G. Is anyone experiencing this problem?

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[Q] No 4G, frequent signal loss

When i got the phone everything was working, when i flashed the uk unbranded firmware (instead of croatian t-mobile branded) I don't get any 4G signal and there is frequent signal loss when I don't have any signal.
Any fix?
I have been thinking of updating through pc companion, but I don't know if it will update to another uk unbranded or croatia t-mobile branded-which I want to try because of 4g and signal loss fix

[Q] HTC one m8 Signals dropping

Hi......
I brought HTC One m8 Sprint H/K phone from ebay. I asked from seller to unlock it by contacting Sprint. He unlocked it and send it to me. While I am using it I saw there was only GSM signals only when I connected to the internet. I followed below steps.
Root it
Flash insertcoin custom ROM (with s-on)
Nothings change
After I followed below thread
http://forum.xda-developers.com/sprint-htc-one-m8/general/enabling-3g-umts-countries-t2847461
I got HSPA signals. But the problem is after i connect to the internet it's disconnected. Voice signals are also the same. During a call call disconnected. (But signal strength shows the same)
Please help me to sort out this issue.....

4G on T-mobile problems

Hello, I have been having some problems with 4G on this phone using the T-mobile network.
From the start I would not get 4G most of the time, I would get 3G,H, or H+ most of the time and it would be very slow.
Then I messed around with the settings and 4G started working flawlessly, but some days ago the problem came back.
There does not seem to be a specific place where this happens, it will happen anywhere.
I used to use this exact same SIM card with another phone(it was a tmobile phone) and never had this problem.
What can be done to fix this?

Unlocked HTC 10 issues with T-Mobile

I've just done a bit of traveling with my carrier unlocked HTC 10 on T-Mobile's network, and I've encountered quite a lot of reception issues with this device. I'm not sure what the issue is, but am curious about others experiences road tripping with this device.
Previously I've only used the phone in my home area (Chicago). The device has performed flawlessly there. This past week, however, I road tripped to Maine and back and had a lot of problems with coverage. I'm fairly new to T-Mobile, so I would normally write it off as their network, but my wife's iPhone 6s performed great in these areas, as did my Moto X Pure Edition.
Here are some of the issues I experienced:
In rural Maine, while the phone was roaming on AT&T, many incoming calls and texts would not come through at all. This behavior was intermittent, despite having 3+ bars of AT&T signal.
While the phone was roaming on AT&T, many outgoing texts would fail to send. Rebooting the phone was often the only way to get them to go through. Again, this was with strong AT&T signal.
Moving between AT&T and T-Mobile coverage areas in rural Maine, the phone would fail to reconnect to T-Mobile service on its own. In order to make this work, I would either have to reboot the phone, toggle airplane mode, manually select T-Mobile under Mobile network settings -> GSM/UMTS Options -> Network operators or, if those all failed, run the LTE Discovery app. I'm not sure why that would make the phone reconnect to T-Mobile service, but it seemed to do so consistently.
The phone would lose signal completly in areas where our iPhone 6s and Moto X Pure Edition had LTE signal
The phone would lose LTE signal and move to 2G/EDGE or no mobile data at all in areas where our iPhone 6s and Moto X had LTE signal
I've seen similar issues discussed over in http://forum.xda-developers.com/htc-10/help/awful-lte-signal-update-t3378163, but it seems I'm experiencing more than just weak LTE signal.
Has anybody else experienced anything similar? Or am I having some sort of hardware issue? It seems crazy to me that this device would perform so poorly compared to the iPhone 6s and Moto X Pure Edition, both of which are also carrier unlocked. HTC told me I should try a new SIM, otherwise there might be a hardware issue, but I'm wondering if this is more widespread than just my device.
Haven't had any issues with mine
Sent from my HTC 10 using Tapatalk
I live in Maine and haven't encountered any issues yet. Although I do live in So Maine so T-Mobile is pretty solid here. I would try the new SIM to see if that fixes the problem.
Are you s-off and unlocked? If so which firmware version are you on? The US Unlocked version or something else? If you're not on the US unlocked firmware I would try flashing that, if you're S-Off. If that fails to fix it then I'd suspect a hardware issue.
BladeRunner said:
I live in Maine and haven't encountered any issues yet. Although I do live in So Maine so T-Mobile is pretty solid here. I would try the new SIM to see if that fixes the problem.
Are you s-off and unlocked? If so which firmware version are you on? The US Unlocked version or something else? If you're not on the US unlocked firmware I would try flashing that, if you're S-Off. If that fails to fix it then I'd suspect a hardware issue.
Click to expand...
Click to collapse
I'm on the US Unlocked version--not sure if it's s-off, I haven't done anything to it myself, so I'm using it however it came from HTC. Not sure if they are s-off by default or not.
Unfortunately I won't be back to Maine to test this new SIM this year. I guess I'll have to test locally side by side with my wife's iPhone to try to determine if it's still dropping coverage so regularly once I get out of a metro area.
I have a T-Mobile model that is running unlocked firmware and I experience switching problems when moving from wifi to lte. Simply put, I cannot connect to T-Mobile after leaving wifi unless I reboot the phone.
3's&7's said:
I have a T-Mobile model that is running unlocked firmware and I experience switching problems when moving from wifi to lte. Simply put, I cannot connect to T-Mobile after leaving wifi unless I reboot the phone.
Click to expand...
Click to collapse
Do you use the LTE Discovery app? I wonder if that would work for you too, running though that process once usually made my phone pick T-Mobile signal back up.
Trooper Thorn said:
Do you use the LTE Discovery app? I wonder if that would work for you too, running though that process once usually made my phone pick T-Mobile signal back up.
Click to expand...
Click to collapse
I have in the past on other phones and I will try here
same problem
I had a same experience where my phone roamed onto AT&T network and it would not come back to T-mobile network. This happened when traveling from Michigan to Columbus OH and Michigan to West Virginia.
Both of the time, only way to fix was go to advanced setting and choose carrier or reboot phone.

T-mobile unlocked 7t lost the signal several time (Day)

Hello! I have a cellular signal problem on my one plus 7t.
it was t-mobile but now it is unlocked. I use it for GSM Network which has the same bands (also I Had anotherOP7T t mobile unlocked and worked perfectly).
periodly the signal lost and I don't know why.
sometimes I need to restart the phone several times to connect the operator, but sometimes it doesn't work.
Maybe it is a Coincidence, But While charging, when the phone is up to 70% signal is active, after 70% -it will be lost.
Maybe it is a Coincidence.
what can I do? is it a software problem or technical one?

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