GSMA TAC Allocation - Device Services
The Authenticity – Ericssoners
What Is an IMEI Number and Why Is It Important? - Airalo Blog
How to Find Your Phone's IMEI Number Fast - Clark Howard
IMEI and how to restore lost IMEI – TechSomeBite
PDF) An overall assessment of Mobile Internal Acquisition Tool
inside TS 23.003: IMEI Check Digit computation
Why do you even need the IMEI? – The AppCensus Blog
Nokia TAC Database 2.0
Check Blacklist IMEI and Unlock Your Blacklisted iPhone