Uses base-16 and consists of 14 characters. It is the primary format used by manufacturers.
Unlike the MEID, the official IMEI standard requires it to be strictly . Device Serial Number: Cell Phone Serial Number Dec Or Hex
Distinct from IMEI/MEID, a manufacturer's serial number (often found in Settings > About) can be (mixing letters and numbers) and does not always follow a standard math conversion like Dec/Hex. Uses base-16 and consists of 14 characters
A 18-digit numeric-only conversion of the Hex ID, often used by carriers for legacy system compatibility. IMEI (International Mobile Equipment Identity): Cell Phone Serial Number Dec Or Hex