I am by no means an early adopter. I tend to things and use them until they are no longer salvageable. I'm also a US expat living in South Korea.
When I first moved to South Korea three years ago, I had an old US phone that couldn't even handle 3G, so I happily upgraded. Now the same phone isn't compatible with the US 4G networks. I make frequent trips back to the US and need a phone that will pick up 4G in both countries.
I'm making another trip next month and I'm planning to buy an unlocked T-mobile 4G-capable phone for use in the US. Then just swapping the SIM cards when I'm back in South Korea and continue to use it as my main phone here.
Has anyone tried this? What should I watch for?