Change sim iphone
if it is iphone 3 or 3s u can use a slim material and put it and the top of the device (there is a small hall) the u insert it and it can go out and replace ur sim card, if it is iphone 4 or 4s the same process but its place at the side of the device and the slim is smaller than iphone 3 or 3s (there is a tool to cut the sim in right way)
good luck
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