When i switched from T-mobile to AT&T i went to my local best buy, and signed up for a plan, and i just got a cheap phone, as i was planning on buying an iphone in a couple of days. I want to know if its alright to take the sim card out of my iphone and put it into the cheap sony ericsson that i got to begin with, and by doing this will it void anything like my data, or is it against the TOU to do this. I go to the beach often and would rather carry a 50 dolar phone with me that my iphone.