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This guide will show you how to switch out SIM cards for all models of the iPhone. Sometimes, you just need to start over. Whether you are switching out SIM cards because you have a new carrier, because your old one stopped working, or simply because you want to swap a SIM card from an old iPhone, changing the the SIM card is easy when you know where to look. But each model is different. Fear not! We've got you covered. Read on to learn all about how to switch SIM cards by opening up the SIM tray on your iPhone.