I have T-mobile. They sent me a defective device. They talked me into trying various troubleshooting problems and contacting Samsung, but the best Samsung could do was try to fix it while I would be without a phone so I eventually decided to go with a refurbished. The problems included things like it sending out blank text messages to people in my phone book at 3am, the s-pen didn't work properly, various other software problems...etc. The list goes on and on. I sent it back and they claim there is physical damage to the phone that is not covered under the warranty. I asked them to send it back to me and then I will file a claim with Samsung, but they do not even have it anymore because they say it has been sent back to Samsung. I am furious because THEY sent me a defective phone then want me to pay for it then wont produce any proof that it actually has the damage they claim it does. They couldn't even tell me what the alleged damage was. I do not actually have a contract with them but I do still owe some on the phone itself. I paid half of it several months ago and have been paying payments along with my bill ever since. I cannot tell you how many people I have spoken to and I refuse to pay for something that was obviously an oversight on their part. My question is, if I take my phone, root it, change it to straight talk, I still plan on paying for the phone itself but in the meantime, can they make my IEMI invalid in the meantime?