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The last number of the IMEI is a check digit. The Check Digit is calculated according to Luhn formula.

The Check Digit is a function of all other digits in the IMEI. The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR and EIR equipment.

The check digit is validated in three steps:

1.
Starting from the right,

double a digit every

two digits (e.g., 5 → 10)

double a digit every

two digits (e.g., 5 → 10)

2.
Sum the digits (e.g., 10 → 1+0).

Check if the sum is divisible by 10.

Check if the sum is divisible by 10.

3.
Conversely, one can calculate

the IMEI by choosing the check

digit that would give a sum

divisible by 10.

the IMEI by choosing the check

digit that would give a sum

divisible by 10.

IMEI: 35145120840121

1. (5x2, 4x2, 1x2, 0x2, 4x2, 1x2, 1x2) = (10, 8, 2, 0, 8, 2, 2) 2. (1+0+8+2+0+8+2+2) + (3+1+5+2+8+0+2 ) = 44 3. Luhn Digit : 6

IMEI: 351451-20-840121-6

More info...

1. (5x2, 4x2, 1x2, 0x2, 4x2, 1x2, 1x2) = (10, 8, 2, 0, 8, 2, 2) 2. (1+0+8+2+0+8+2+2) + (3+1+5+2+8+0+2 ) = 44 3. Luhn Digit : 6

IMEI: 351451-20-840121-6

More info...