Hey there, so i found out by att that if i just pop my sim thats in my ericsson into the iphone, they will automatically change my plan to a data plan, which i dont want. SO now im wondering, can you still use the iphone normally (as an ipod, use apps etc) with out a sim card inserted? Because i don't want to give the iphone away, as i am going to use it as a phone in the future, so can i still use it normally? And what about activation? How do you activate it? Do i just put in my sim and then its activated and then i can just take it out? Reply soon! Thank You!!!