How to decode your iPhone serial number

Summary:Your iPhone's serial number is a treasure trove of interesting data - including its manufacture date and factory ID. Here's how to decode it.

I just got a replacement iPhone 4 for the iLemon that I've been blogging about here lately and, so far anyway, the Bluetooth problem seems to have disappeared.

I haven't had a chance to test it exhaustively yet (it's only been a few hours), but I was intrigued by this blog post at iFixIt about how Apple may be applying a non-conductive coating to the metal frame on the second-batch of iPhone 4s to help mitigate the antenna issue.

The interesting part is that iFixIt details how to decode the iPhone's serial number:

aabccdddeef aa = Factory and Machine ID b = Year cc = Production Week ddd = Unique Identifier ee = Color (A4=black) f = size (S=16GB, T=32GB)

The serial number on the unit tells you the manufacture date; our original phone was manufactured in mid-June (week 25). The replacement unit we got was made in early-July (week 27), apparently too soon for a manufacturing change.The serial number also identifies which factory it was made in. (We don’t have a mapping of numbers to physical factories, but we can tell if two phones came from the same plant.)

My serial numbers: 85025xxxA4T (original 32GB iPhone 4- June 24) 86027xxxA4T (replacement - July 15)

My replacement iPhone 4 is a week 27 unit, fabbed a scant two-weeks into the production process and too soon for a manufacturing change.

If you've had your i4 replaced, post your serial number (minus the unique bit) in the TalkBack below.

Topics: Hardware, Apple, iPhone, Mobility, Smartphones, Telcos


Jason D. O'Grady developed an affinity for Apple computers after using the original Lisa, and this affinity turned into a bona-fide obsession when he got the original 128 KB Macintosh in 1984. He started writing one of the first Web sites about Apple (O'Grady's PowerPage) in 1995 and is considered to be one of the fathers of blogging.... Full Bio

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