Hello, my friend that has a Galaxy s3 asked me to flash his sprint phone to straight talk. I don't think this is possible because of it being a gsm phone. Now he wants it flashed over because it was his friends bill who somehow gathered a $300 bill on it. I don't know how but he did. Anyways, are there any carriers he could switch to? I know T-mobile that pay the rest of your contract thing but I don't think it applies to this situation with the contract being over. I've tried to google some things but it didn't really help