I need to get a prepaid gsm service for voice and data for my iphone 5 and went to an AT&T store. I tried to get the GoPhone service which you can get for just a month, since I am just visiting the US and the guy at the store told me that it might not work data on an iphone because the service will recognize it is an iphone and it wont let it work. Is this true, and if it is, since 2 guys in 2 different stores told me the same, is there a fix for it?