It can also be printed inside the battery compartment of the phone. IMEI in iPhone & iPad. 1  Go to phone settings. 2  Then select the General. 3  In the About field you will find your iPhone IMEI. 4  In iPhone 3G, 3GS, 4 and 4s you can check the IMEI number on SIM card tray.5  In iPhone 5, 5c and 5s IMEI number is engraved on the back cover.he IMEI is only used for identifying the device and has no permanent or semi-permanent relation to the subscriber. Number is used by the GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing the network in that country.