If you've ever called your carrier's customer service to activate a prepaid SIM card or troubleshoot a malfunctioning Android ...

On newer iPhones like the iPhone 6s, iPhone 7, and all subsequent models, Apple places the IMEI number on the SIM card tray.

Every iPhone has a unique serial number, which can be used to identify the specific handset you own. You may need to know the serial number of your iPhone if you're unlocking it through your ...