IMEI Calculator is a free Android app developed by CellDe. This app helps testers who need to generate multiple valid IMEI numbers for different devices for mobile buyback applications or any other testing purposes. The app calculates the 15th check digit of an IMEI number by applying the LUHN algorithm to the first 14 digits.

With IMEI Calculator, testers can easily create a valid IMEI number by entering the first 14 digits and getting the 15th check digit. This app is straightforward and easy to use, making it a helpful tool for anyone who needs to generate valid IMEI numbers.