IMEI Number Validator & CEIR Lost Phone Guide

Verify the authenticity of any 15-digit IMEI number with the Luhn algorithm checksum. Learn how to block and trace lost/stolen mobile phones on the Govt Sanchar Saathi CEIR portal.

Interactive IMEI Number Validator & CEIR Lost Phone Guide
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Formula & Calculation Methodology

Luhn Mod-10 Algorithm: Double every second digit from left to right; if doubling results in > 9, sum its digits. Total sum must be divisible by 10.

sum_{i=1}^{15} f(d_i) equiv 0 pmod{10}

Step-by-Step Worked Example

IMEI: 867942041234567

  1. TAC (First 8 Digits): 86794204
  2. Serial Number (Next 6 Digits): 123456
  3. Check Digit: 7
  4. Luhn Checksum Verification: Passed (Valid Modulo 10 sum)
Result: Valid IMEI Checksum (Genuine 15-digit format)

Frequently Asked Questions

How do I find my phone IMEI number?

Open the dialer on your phone and dial *#06# to immediately display the 15-digit IMEI1 and IMEI2 numbers on screen.

What is CEIR by the Department of Telecommunications (DoT)?

Central Equipment Identity Register (CEIR) is a Government of India portal that enables citizens to block and trace stolen/lost mobile devices across all Indian telecom networks (Jio, Airtel, Vi, BSNL).

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