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Calculating the check digit of IMEI
Luhn algorithm [WiKi]

                 
1. Compute the sum of all digits on odd places.
                = 
2. Replace the digits on even places by the formula:
0=>0, 1=>2, 2=>4, 3=>6, 4=>8, 5=>1, 6=>3, 7=>5, 8=>7, 9=>9 and summarize them.
                 
                = 
3. Summarize the two results. + =
4. In case the sum of digits ends in 0, 0 is the check digit. Otherwise, the checksum is equal to the number that needs to be added to the result to get the next highest "round" number.
Check digit + =