Swapping SIM cards on an iPhone is a simple process that allows you to change carriers, upgrade to a new SIM, or use a local SIM while traveling. This step-by-step guide covers everything you need to know, from locating the SIM tray and using the ejector tool to safely inserting a new SIM card. We’ll also address common troubleshooting tips, eSIM options, and how to ensure your iPhone recognizes the new SIM without issues. Whether you’re switching for better network coverage or international use, this guide makes the transition seamless.