Some one said you won't be able to find the US unlocked version of the G3, he's right so far. I was on that boat too. I couldn't wait to get my switch to the new G3 and Amazon, Bestbuy, or even freaking going to the phone stores such as ATT or T-Mobile would sell it. I forgot to think of ATT and T-mobile as a service provider instead of a phone store because they obviously only wanted to sell plans and the phones are pretty much accessories of those plans.
Anyways, long story short, I got my unlocked G3 (ATT version) via ebay. Then I used it on Straight Talk. Everything works the way they are suppose to and I am getting ATT LTE speeds too, just at half the price. There are only 2 things that doesn't quite work. One is sending and receiving MMS. The other is visual voicemail. MMS thing, I still have to call straight talk up and deal with their infamous customer service. The visual voicemail thing, I just use youmail and it works ok and an alternative. Some ads here and there, and the interface isn't the best in the world, but at least it works. It's a shame that LG doesn't sell their own unlocked phones via their own website like HTC does.