I have an original 2G iphone which has been unlocked since I travel overseas frequently. HOwever, I am a legitimate AT&T iphone plan subscriber. My phone needs some fixing before my warranty runs out so I restored it without any trace of it being hacked before. There are some issues with it and needs to go back to the Genius bar and I left it with my husband to get it taken care of since I'm on the road traveling. As a result, I took the SIM card out since I needed the SIM. Can my husband put his SIM card in while he's in the store (he's also on an iphone plan). Would they be able to figure out his SIM doesn't belong to that phone?