IMEIs also have a concept of 'error' detection built in: https://stackoverflow.com/a/25229800 https://stackoverflow.com/a/25229800 https://en.wikipedia.org/wi

IMEIs also have a concept of 'error' detection built in: https://stackoverflow.com/a/25229800 https://stackoverflow.com/a/25229800 https://en.wikipedia.org/wiki/Luhn_algorithm https://en.wikipedia.org/wiki/Luhn_algorithm