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Swappa requires all cellular-connected devices to be fully functional, ready for activation, and have a clean ESN / IMEI / MEID. Swappa employs a team of moderators that review listings before they are approved to ensure listed devices meet the requirements. Swappa also provides a free ESN check service that is available to the public. [12]
The last number of the IMEI is a check digit, calculated using the Luhn algorithm, as defined in the IMEI Allocation and Approval Guidelines: The Check Digit shall be calculated according to Luhn formula (ISO/IEC 7812). (See GSM 02.16 / 3GPP 22.016). The Check Digit is a function of all other digits in the IMEI.
It consists of three fields, including an 8-bit regional code (RR), a 24-bit manufacturer code, and a 24-bit manufacturer-assigned serial number. The check digit (CD) is not considered part of the MEID. The MEID was created to replace electronic serial numbers (ESNs), whose virgin form was exhausted in November 2008. [1]
To avoid confusion the database of GSM Association was renamed to IMEI Database - IMEI DB [1] (it was in 2003-2008, see “Document History” at IMEI Database File Format Specification [2]). Also sometimes a common IMEI database for several EIRs is called SEIR (Shared EIR). In each country, the CEIR can interact with IMEI DB differently.
If the phone needs to be unlocked within the first six months, the carrier can charge DKK 500 (~ €67) [30] for the unlock. After six months, the carrier is obliged by law to unlock the phone free of charge. But the consumer needs to contact the original supplier, and provide the IMEI and original phone number for which the phone was sold.
RingMyCellphone is free up to three times per day. Its wake-up function is also free, from anywhere in the world. You can use it free up to two times a day; after that, it's $2 for up to five more ...