So when my iPhone is done, i was thinking, can i just take my iPhone SIM and stick it in a blackberry or any other AT&T phone? I went to their site, and with a regular phone, i can get the data $15, and 200 texts $5 added to a plan, but with the Blackberry, PDA data is $30 a month. How would this work, and could i get past the system, as long as i kept my iPhone in case anything happened?