3G issue (d855) - G3 Q&A, Help & Troubleshooting

Good day masters,
I am having some issues connecting my g3 to the internet using data. My device won't connect to 3g. It's weird because it can connect to 4g and 2g network.
How can I solve this?
Thank you everyone for helping me out.
PS
It happened after upgrading from LL to MM via LG support tool.

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Try to use Fulmics Rom 5.3, I have it without any problem on signal
jemack5 said:
Can someone help me fix my lg g3 signal problem. Experiencing no signal, since unable to connect to network operator but i have signal bars. Sometimes can connect manually to network when signal is strong but always automatically no signal. Is it hardware issue or software issue? I already tried other roms and downgraded to kitkat but still no to avail. Please help. Thanks.
Click to expand...
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Bro, could you fix this problem? Cause im having exactly the same problem right now and i dont now how to fixit, please contact me as soon as you can please and forgive my bad english, i speak spanish, thank you
mtov93 said:
Bro, could you fix this problem? Cause im having exactly the same problem right now and i dont now how to fixit, please contact me as soon as you can please and forgive my bad english, i speak spanish, thank you
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Guys, unfortunately i have this same problem. My only option was just use the 3G signal (selecting on network settings). Its been passed 5 months and i still dont know how to fixed. I tried every ******* thing and the problem remains, at least choosing the 3g signal i can use my phone as a phone !!
obs: the problem started after updating to original MM.
I also have this issue, or similar.
Mine occurs when i connect to wifi whilst using 4g. If the 4g signal drops it wont automatically switch down to 3g. I have to do it manually , by changing to 2g/3g in network settings. auto/2g/3g/4g works fine whilst not connected to wifi though.
Mine seemed to start doing this when i first flashed MM or Fulmics.
I have tried flashing old radios, doing a complete unroot factory stock kds flash but nothing has fixed the issue.
Anyone any pointers or an explanation as to what could have possibly happened?
Cheers all
I had the same problem.
I flashed RPM and correct modem.
No signal drop anymore but no LTE.
Flashed modem again and RRom and it works perfect now!
I guess I should flashed the modem twice at the beginning.

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Hello brother I have the same problem now with my D855, and I realized when I go a little bit far from the router the Wifi dissconnects and it think it is a WiFi antenna problem
I am looking forward to find this part and try to fix it or send it to someone who can fix the phone
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