IMEI vs IMEISV

Client

IMEI (15 digits) and IMEISV (16 digits) both describe the modem but serve different GSMA fields. This page explains the layout difference and lets you paste either length for local classification and segment readout.

Quick comparison

IMEI: 15 decimal digits, Luhn mod-10, TAC + serial + check. IMEISV: 16 digits, adds software version information—validate with IMEISV-aware parsing, not IMEI-only truncation.

Privacy: digits are parsed only in your browser—no carrier or GSMA lookup, no upload. Treat device identifiers like any sensitive paste on shared machines.
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A 15-digit IMEI is commonly described as eight-digit TAC + six-digit serial + Luhn check digit; the trailing digit should satisfy ISO/IEC 7812 mod 10 on the full string—same arithmetic as debit/credit PAN checks. A 16-digit IMEISVappends two software version digits instead of exposing the standalone check position; carriers may still relate it to IMEI numbering but this page stops at segmentation and does not certify assignment.

Result

Passes Luhn mod 10 on the 15-digit string.

  • TAC (8): 35693803
  • Serial (6): 564380
  • Check (1): 9

Common use cases

  • Decide which field a portal form expects before paste.
  • Train support on dual-field device About screens.
  • Audit CSVs that mix IMEI and IMEISV columns.

Common mistakes to avoid

  • Truncating IMEISV to 15 digits for Luhn

    IMEISV layout differs—do not drop the software version digit blindly.

  • Using IMEISV where carrier forms ask for IMEI

    Read the form label—many portals want 15-digit IMEI only.

  • Expecting either field to prove SIM ICCID

    ICCID identifies the SIM profile—a different identifier family.

FAQ

What is IMEISV?

IMEI Software Version—typically 16 digits including a software version field per GSMA layout.

Which should I paste for activation?

Follow your carrier portal label—usually 15-digit IMEI unless IMEISV is explicitly requested.

Does this page query GSMA?

No—local length, Luhn where applicable, and segment hints only.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

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More tools

Related utilities you can open in another tab—mostly client-side.