When our contract ran out a few years ago, the wife and I decided to try out Straight Talk. So far we couldn't be anymore happy with the service. 90% of the time we are on some kind of WiFi so 4g service is not crucial to us. Anyway we bought cheap android powered phones to just to make sure we was gonna be happy with the swap. So a few weeks ago we decided to pick up two unlocked Galaxy S4. I meet a guy in Atlanta and gave him $600 for two of them, they were GT-I9500 models. We tested the phones and all seemed fine. When I got home I inserted the SIM cards and got it all setup. Well I got to noticing my phone was pretty glitchy and the camera seemed a little off. I compared mine to a buddy's after work and i knew something wasn't right. After doing a quite of bit of research I found out there was such thing as a Galaxy S4 clone. I downloaded a few apps from play store that can test the authenticity of the phones. They are clones. The camera is half he MP, the processor is half the speed, the RAM is tiny, the screen is 720 not 1080, and quite a few other things as well. I also found out these things are running on a Linux software setup to look like Android. Anyway, Ebay is getting flooded with these clones and going for like $20 a piece. There are apps in the store that can test the phone and tell to if they are genuine or not. I just found out a little late. Beware