: Test all physical buttons (Volume, Power, Silent switch), both front and rear cameras, speakers (check for crackling), microphones, and the charging port.
: Obtain the IMEI number (found in Settings > General > About or on the SIM tray) and use an online IMEI checker to confirm it hasn't been reported lost or stolen. 3. Understanding iPhone Model Origins buy used iphone
These checks are critical to ensure the phone is not stolen or permanently locked: : Test all physical buttons (Volume, Power, Silent