312-49 · Question #484
The Electronic Serial Number (ESN) is a unique __________ recorded on a secure chip in a mobile phone by the manufacturer.
The correct answer is C. 32-bit identifier. The Electronic Serial Number (ESN) is a unique 32-bit (4-byte) identifier burned into a secure chip by the manufacturer to uniquely identify CDMA mobile devices. It was used by CDMA carriers (e.g., Verizon, Sprint) to authenticate devices on the network. The 32-bit ESN format was
Question
The Electronic Serial Number (ESN) is a unique __________ recorded on a secure chip in a mobile phone by the manufacturer.
Options
- A16-bit identifier
- B24-bit identifier
- C32-bit identifier
- D64-bit identifier
How the community answered
(22 responses)- B5% (1)
- C86% (19)
- D9% (2)
Explanation
The Electronic Serial Number (ESN) is a unique 32-bit (4-byte) identifier burned into a secure chip by the manufacturer to uniquely identify CDMA mobile devices. It was used by CDMA carriers (e.g., Verizon, Sprint) to authenticate devices on the network. The 32-bit ESN format was later succeeded by the 56-bit MEID (Mobile Equipment Identifier) as the address space was exhausted. A 16-bit identifier would be far too small (only 65,536 unique values), while 24-bit and 64-bit do not correspond to the ESN standard.
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