The iPhone uses an ESN, IMEI, MEID, ICCID or a combination of these numbers to identify the device. Each provides the information necessary to identify the iPhone. One simple way to archive the information involves taking a screen shot of the information directly on your iPhone. You can then store that information on your computer for future reference. You might need one of the numbers if you want to unlock the device or prove to a potential buyer that you hold a legal iPhone, or if you need support online. Warnings Writer Bio
