I've been looking to sell my Galaxy S II GT-I9100 so I can pickup the Galaxy S III and found some interesting data in this Galaxy S II resale value price guide. I wasn't necessarily expecting to get more for my unlocked GS2, but I was surprised that the T-Mobile version's price was so [relatively] high as well. FYI, I bought my phone new, back in November off Craigslist for 500, so I've almost used it for 8 months. I guess $350 ain't too bad. Have any of you been able to get more than that for your phones? I'm curious if it's true the T-Mobile version has a high resale value because T-Mobile has very few competing phones (no iPhone).