Hey guys Im going to try to explain everything that I can, and maybe I can fix a few of these problems. First of all I bought a used Galaxy S2 that is a at&t phone. I noticed some "non factory" apps so I decided to do a factory reset. First thing I noticed when I done a factory reset, was when it started booting up to the getting started page it was in some language that I have never seen before..I was able to change it to US and log into my google account. Im not sure what that was all about. After all of that is finished I look and the same apps are still on my phone, just a few random games and a couple that are in that weird looking language. Also the "back" and "search" buttons do not work, they light up but I have to hit "home" to go back. Well I previously had a at&t iphone 3g also using straight talk, I removed the card and inserted it into my galaxy and powered off then on. I was able to send and receive texts, I was able to call and recieve calls but I could not hear them and they could not here me. I also could not pick up any network, EDGE or 3G. I rememberd that I had to change a few things on my iphone that came with the instructions with my straight talk sim. So I made the same changes to my galaxy; Name: Straight Talk APN: att.mvno Proxy: proxy.mvno.tracfone.com Port: 80 MMSC: http://mmsc.cingular.com MMS Proxy: 18.104.22.168 MMS Port: 80 After this I still have the same problems, except now my galaxy shows I am on the EDGE network at my home, which is normal. I called the guy I bought the phone from and he said he never had any of those problems with the phone... Here is some of the Info on my phone, I really hope there is nothing wrong with it and maybe some of you guys can point me in the right direction. MODEL NUMBER: GT-I9100 ANDROID VER: 4.0.4 BASEBAND VER: I9100XXLQ6 KERNEL VER: 3.0.15-I9100XWLPM-CL837163 dpi@DELL145 #3 SMP PREEMPT Thu Jul 5 11:26:14 KST 2012 BUILD NUMBER: IMM76D.XWLPM ok, well after updating my apn settings, I can now mms and connect to 3G, E, H, and H+? Not for sure what the H means, but it was just as fast as my friends iphone4 with him having 4g. I connected to Kies to see if I can update my firmware and it says Your device does not support firmware updating via Kies. I am so confused guys, I do not have a clue what to do. Its almost like this phone is not an american version, or the previous owner has messed with it to cause these problems. I hope someone can get with me soon about this.