switching sims?
 

hey so i am getting an unlocked at&t 9700 bold so it will work with rogers 3g. the thing is u need a 3040 sim card in order for 3g calls and text to work for the at&t bold 2 and i have a 4000 sim card. how do i deactivate my 4000 sim card without getting it blacklisted because if i report it lost most likely it will become blacklisted and not actvateable. just in case i need my 4000 sim card in the future how would i deactivate it so i would be able to activate it in the future with no problems, call them and say wut??