[G2 Q&A, Help & Troubleshooting] raidrum:
Hello xda. I need help.

The Issue: Bought a stock US LG G2 D800, unlocked (but AT&T branded) off a reseller on e bay back in May of 2015. The seller advertises their phones as new/unused. Long story short, the phone basically has been unusable to me for it's main function - to make/receive/maintain phone calls.

I've researched a ton online, and here on xda, but have yet to find a definitive solution for the G2. I first was trying to use the phone on a Tmobile service provider: Family Mobile. Then because of the crapped out signal reception, I tried other service providers because I thought the there was something up with Family Mobile. I tried - Metro PCS, Straight Talk, then finally straight AT&T. My signal fluctuates between 1 and 3 bars of service at home every 30 seconds to 1 minute with all of those service providers. At 1 bar, I'll either drop calls or can't carry on a conversation.

I've spent hours talking to customer service reps and changing my settings with no resolution only to finally put the last SIM card into my old BLU phone and immediately get at least 3 bars of signal at home. Every service provider stated my area of Southern California (I'm just east of Los Angeles) was well covered for voice and data LTE service. For years prior to getting the G2, I in fact had good service at home with my previous phones and most everywhere else (I had been with Tmobile Walmart Family Mobile for at least 4 years before getting the G2).

An AT&T Microcell signal booster at home works, but I need to use voice services everywhere else anybody else would, and the issue is apparent anywhere and everywhere. Once in a while, depending on where regionally I am, it will get full 5 bars of signal, but that is rare.

The phone has a 1 year warranty. I've sent it to LG for repair 3 times and they just give me the run around. First they replaced the camera, then they said they found no problem, finally they said it was a Flash Memory issue. I've read that they blacklist some phones after the first visit for repair.

I read all through this post but found no exact fix for US phones - http://xdaforums.com/showthread.php?p=46648526#post46648526

The seller sent me another new G2 phone, and guess what, same issue. The first phone was updated to 5.0.2. The replacement phone is still running 4.4.2. Yet the problem is the same, only that the 5.0.2 phone also has the GPS connectivity issue and the hot battery issue.

I still have both phones, although the seller asked me to send back the "bad" phone. From all I've read, the issue is either related to some D800's software or bad design of antenna. I saw the video on the GPS/Signal fix but tried it and that didn't do anything for me.

Some G2 owners from Europe and the Middle East have fixed their signal issues by rooting and going from there. I have never rooted a phone and don't have experience with flashing rom's and related, but I'm willing to learn. Does anyone have any knowledge of a US specific fix for this issue? I'll either stay with AT&T, or since I know Tmobile service actually works (and it's cheaper), I may go back to them, so if there is a software fix, it may be AT&T or Tmobile specific from what I've read.

Thanks.