[LG G Flex 2] br0adband:
I've looked over this thread and a few others and I have to say so far this Flex 2 is getting the better of me. I recently had an LG G4 (LS991 Sprint variant) and unlocking that phone using the method from mayrer and for a few minutes, like 3-4 minutes tops, I actually got T-Mobile working properly with calls, SMS/MMS, and data without any issues on LTE Band 4 and was very happy to do it.

Then it just stopped working and it pissed me off. :)

So, I have an LG G Flex 2 LS996 Sprint variant, I'm currently using ZV9 rooted (I did the full OTA upgrade path from ZV5 which was on it when I bought it to ZV6 then ZV7 then ZV8 to ZV9, had an issue, rolled back to the ZV8 TOT, had issues with the ZV9 OTA so I flashed the rooted ZV9 system img directly and I don't seem to have any issues with the device currently.

I'm just trying to get T-Mobile working as it "should" work considering this device is fully capable of running on LTE Band 4 without any issues as I've actually done it. At this point my frustration is pretty high so I'm hoping that someone might have had or is having issues like I am. I decided to redo everything today cleanly, full clean ZV8 TOT flash, then ZV9 rooted system img flash and it's of course not working. I'm still working out the methodology I want to try this time around and see what happens.

There appears to be several methods that people have reported so I was kinda-sorta hoping to narrow things down and find a pure working method that just works but so far I haven't been able to do that. With the G4 after I discovered that all it really takes to make the Sprint LS991 useful with T-Mobile is modifying the build.prop to remove all traces of SPR (replaced by GLOBAL) and the p1_spr_us string with p1_global_com and target country to COM - that's all it takes and it worked flawlessly. I didn't have to do anything else to get T-Mobile working aside from adding the APN data and it just worked from that point on.

On the Flex 2 I was kinda-sorta hoping that modifying the build.prop in a similar manner would have positive results but it obviously didn't and still hasn't proven useful at all in my attempts which of course just frustrates the hell outta me even more.

I'm not in a big hurry I suppose but I honestly hate it when I can't work out a solution to this kind of problem - I hate it when technology gets the better of me, basically. :)

So I'm all ears if anyone has any suggestions on what to try next - I've tried the "popular" and mentioned methods, I've edited the build.prop in several manners including modifying the NV/RUIM to SIM and still no dice, I've used ShortcutMaster to create APNs that stick but still don't allow me calls or data of any kind. I've changed the modes from GSM/WCDMA/LTE to LTE only (which is what worked with the G4), LTE/CDMA, etc and still no effect. All I get all the time is the signal bars and the tiny rotating arrows with no connection actually ever happening.

One attempt earlier today actually had it reading the SIM card properly and even in spite of it not allowing me to make any calls or use any data at all it somehow magically pulled down some voicemails from the service it supposedly can't even connect with. :(

Anyway, I'll keep trying to get it functional, maybe I'm just missing or skipping one crucial step in my attempts, a rookie error sort of thing, who knows.

Will be nice to get it fully functional on T-Mobile at some point. Well, at least that's the hope that drives me. :)