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i used my other line to order the 3gs, can i put my sim in it and activate the phone? or do i have to put the sim in from my other line to activate it?

well i just tried it, worked like a charm, tossed the sim from the phone that i wanted to use the 3gs on into the phone, connected it to itunes and it poped up saying you are activated, didnt mention the other phone number that was suppose to be upgraded.