I'm creating this thread cuz no other helped me and are close to my problem. Before the beginning of all the issues, mobile was working fine with cloudyG3 2.5 and after messing up something in 3845*990#, got booting error and I had to flash ls990zv8 using flash tool and rooted it installed a custom recovery and installed cloudyG3 2.5 again, but this time whatever I do, the mobile data wont turn on. Changed APN, tried switching from global to LTE/CDMA to Global again but no luck. Tried all the GSM roms out there but the issue is still there. Also tried installing ZV4 bandbase. But, nothing happened. Guys, please help me with this issue. Tried replying to the respective rom threads, but got no reply.
Not even a single reply. Thought XDA members help each other. This was the only forum I constantly choose to comeback for its content. If you guys choose to ignore that's fine and goodbye.
Take a look around this section. It's fairly dead. Of the few that remain, maybe no one has had an answer for your problem. I have this device and I rarely look at anything in the section since Sprint abandoned the G3. I go to the Fulmics thread in the bigger G3 section and that's about it. I can tell you that while XDA is helpful, a pissy attitude will get you very little, if any, assistance.
Now.....on to your issue.
You say you flashed back to ZV8 using a flash tool. Was that a tot file flash with the LG program? If so, did you have working data on the stock LG ROM once that was done? If no, you have a device issue.
If yes, and data is gone once you're on a custom ROM, it's a software problem. Try flashing MVNO Slayer (just search, it's in a Moto E section I believe). That will let you choose Sprint as the carrier and will properly set the APNs.
If that doesn't get you going, I'm out of ideas.
It's not about the pissy attitude and this is not the only post I made and got no reply for days. And I'm talking about no data with non-sprint sim cards on GSM roms. I said before all this it was on CloudyG3 2.5 which is a GSM rom and data was working on E/3G/H+. Now I can see that the network does stay on HSDPA in network info and the mobile connection state is disconneted all the time. I want to use this device as GSM.
I can't say for certain, but it sounds like you need to do a sim unlock.
http://forum.xda-developers.com/sprint-lg-g3/general/unlock-sim-gsm-how-to-t2853594
Did that too on stock zv8 and had no luck. I can use the sim for calls, texts and from network info, I can see that the network does stay on HSDPA but the mobile network state is disconnected all the time. Before all this, I was able to use upto H+ speeds on any network. Now, it won't turn on.
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