I bought a galaxy s5 used and found out that it is sim locked through sprint. After trying to unlock it I also found out that sprint is one of a carrier that u can`t unlock! I was told that it can be rooted to work with other carriers and I think that xda has instructions on how to do this. I`m not a programmer or developer but I do investigate and try my best to learn. It would be appreciated if someone could help me.