Apple includes a "SIM eject tool" with the iPhone 3G. If you don't have this tool, don't worry, an ordinary paperclip works just as well. Insert your SIM eject tool or a paper clip into the hole next to the headphone jack. Press down on the tool until the SIM card tray pops out. /Guide/Repair/iPhone-3G-SIM-Card/573/all#s2779 Apple includes a "SIM eject tool" with the iPhone 3G. If you don't have this tool, don't worry, an ordinary paperclip works just as well. Insert your SIM eject tool or a paper clip into the hole next to the headphone jack. Press down on the tool until the SIM card tray pops out. /Guide/Repair/iPhone-3G-SIM-Card/573/all#s2779 Remove the SIM card from the SIM card tray. The cut-off corner should make it easy to reinstall the SIM card in the correct orientation. /Guide/Repair/iPhone-3G-SIM-Card/573/all#s2780