[G2 Q&A, Help & Troubleshooting] mulderato:
OK... VS980 4G LTE issue FINALLY solved for me... this is what has happened:

I followed the instructions and installed the correct rom for the VS980 in Aroma a month and a half ago and ever since I was on a weak 3G roaming signal. I did the build.prop edits... changing:

ro.build.target_country - Change from COM to US (US is supposed to be in CAPS)

ro.build.target_operator - change from GLOBAL to vzw (be sure vzw is lowercase)

Was still a no-go for me. I attempted to track down and delete the lte.config.apk and .odex but no luck either as I discovered that they do not exist on the Verizon VS980. At the time I was running CloudyG3 1.2.

During this process I was PM'ed by "Jokulgoblin", a new user that had been through the same thing, He had 4 G2's, 3 of which all had suffered the same issue as I was having. Jokulgoblin had gone to Verizon and picked up new SIM cards for the three with the issue and all returned to 4G LTE without issue. Knowing via the tweet that Cloudy was about to drop a new version I waited for 2 weeks before getting a new SIM... something with the ROM may be triggering the issue and I didn't want to have to return twice in as many weeks.. Once 1.3 had dropped I downloaded, wiped and did a clean install hoping that a fix was in.... but unsurprisingly the issue remained.

As a test I rebooted, wiped all clean again and this time installed the most recent nightly of CarbonRom.. what I was on before CloudyG3 and the issues... to my surprise... my lack of 4G LTE remained... and acted just the same... toggle airplane, it would hold for a minute or two and then straight to a weak 3G signal with roaming data. This confirmed to me it was linking to the SIM. In our PMs, Jokulgoblin mentioned that the new SIMs are different... being NFC compliant so that they can utilize the ISIS wallet.. which may play a part in this. Also, through my own research on XDA I found multiple instances where G2 owners had issues with dropping 4G LTE and a SIM replacement was the only thing to fix it.. even it it was just temporary which double backed-up the claimed fix.

So.. before heading to the Verizon Store I reflashed Cloudy3 1.3, made the build.prop edits. I got a new SIM, put it in... 4G LTE. I think there is a place in the build.prop where it is reverting it to "Global" by default on reboot but I am not sure what that needs to be changed to as I did experience an issue this morning where I went through a low reception area and it hopped onto a 3G network and didn't switch back until I put it on LTE/CDMA/EDVO. Since then its been golden.

I hope this helps anyone that has been through the same issue. A special thanks to Jokulgoblin.. without his help I would have been in the same situation and going crazy because even going to a different ROM was no longer helping. And to Cloudy also for porting this for us G2 owners to enjoy. Something in CloudyG3 1.2 triggered the change that only a SIM replacement would fix... and I am not smart enough to know what that could be. I will cross post this in the Dev section also so it may help the developers find the problem where as here it might help some of you fix the problem. All I can say is I am happy that I finally have this rom running as it should.. even if my toggles are a bit broken!