Is a valid checksum enough to trust a phone?
No. Checksum only proves the number is well-formed. Use blacklist / warranty checks and physical inspection for purchase decisions.
IMEI validator and TAC lookup
Validate a 15-digit IMEI with the GSMA Luhn check digit, extract the Type Allocation Code (TAC), and match community device references. No paid API required.
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IMEI validator FAQ
What is TAC?
The first 8 digits identify the device type allocation. Serial digits follow, and the last digit is the check digit.