For the Identification of the mobile device, there's integrate the number in the Chip of the Device. In iphone, there's also available the IMEI (International Mobile Equipment Identity) number in the Chip or which can be viewed from "Settings app -> General -> About".
Typically, the serial number of iPhone is in the following format:
AABCCDDDEEF
For example, 88025xxxA4T, where the serial information can be decoded as following:
AA = Factory and Machine ID
B = Year of Manufacturing (9 is 2009/2019, 0 is 2010/2020, 1 is 2011 and so on)
CC = Production Week (01 is week 1 of B, 11 is week 11 of B and so on)
DDD = Unique Identifier
EE = Color (A4=black)
F = size (S=16GB, T=32GB)
While the last 3 digits of iPhone serial number are indicative of color and size, the 3-digit should be read together to determine which generation, size and color of iPhone. Here’s the list of possible iPhone models:
VR0 (iPhone 2G Silver 4GB)
WH8 (iPhone 2G Silver 8GB)
0KH (iPhone 2G Silver 16GB)
Y7H (iPhone 3G Black 8GB)
Y7K (iPhone 3G Black 16GB)
3NP (iPhone 3GS Black 16GB)
3NR (iPhone 3GS Black 32GB)
3NQ (iPhone 3Gs White 16GB)
3NS (iPhone 3Gs White 32GB)
A4S (iPhone 4 Black 16GB)
A4T (iPhone 4 Black 32GB)
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