Hello Forum, So an acquaintance sold me an iPhone 5S last night and i own a iPhone 4S that is on Sprint. I have a pretty good idea that he purchased his phone from T-Mobile or it might be unlocked (there was no sim card in slot). Can i request a Sprint nano Sim and use it with that? or i would also be open to getting a T-Mobile plan. Or can i cut my existing Sprint sim to make it nano? Which would be the best option for me? Thanks in advance!