Hi, I would like to buy an iphone 4s, the problem is that i'm planning to moving out to FL.for a couple of months and then out of the country. My mother told me that she can upgrade her phone and give it to me ( her carrier is sprint), and she later buy a new one. My question is.. can avoid the two years contract and pay monthly for the service without 2 years commitment? Jailbreaking the iphone? Or just buy one unlocked? Thanks.