How to find my serial number for my iPhone 4 know that I do not have the sim tray and the phone is Not powering up or connecting to iTunes
Read this http://support.apple.com/kb/ht4061
You can find it by looking at the backup in itunes
iOS- How to find the serial number, IMEI, MEID, CDN, and ICCID number
How to find the serial number of your Apple hardware product
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