Putting in a new sim card?
You will need a sim card tool or a paper clip will work. Locate the sim card tray: iPhone 3 and 3gs are located on top iPhone 4 models and up located on side of iPhone. Remember different iPhone models use different size sim cards please check which size is right for your iPhone model before purchasing it. Use diagrams below to locate sim card tray and for correct Sim card size for your iPhone model.
The following diagrams are to help you remove your Sim Card from your iPhone and correct size sim card for your iPhone model.
To remove the SIM card from your iPhone, find your model below and follow the diagram. After you remove the SIM card,. Insert new sim card into the tray in the same orientation that you removed it (it will only fit one way).