IMSI format check

Client

Format-only check—pairs with ICCID and IMEI validators.

About IMSI format check

Validate International Mobile Subscriber Identity length and digit shape. Processing runs in your browser—Toolcore does not need your paste for the core operation on this page.

Format and checksum rules only—no live registry, carrier, or customs lookup from this page.

How to use

Paste or type in the main field, then read the output below. Use Load example when available, or open the page with ?q= / ?qb= so tickets and agents share the same input.

Loading…

Nearby workflows on Toolcore

  • ICCID checker (SIM) — 18–22 digit ICCID: telecom MII hint (89), E. Useful when the same row uses a different identifier ruleset.
  • IMEI & IMEISV checker — 15-digit GSM IMEI: TAC/SNR split and Luhn verification; 14-digit check hint or 16-digit IMEISV segmentation—no carrier lookup; browser-only. Useful when the same row uses a different identifier ruleset.
  • MEID checker (CDMA) — 14–15 hex or 18–19 decimal Mobile Equipment Identifier—Luhn mod‑10/16 check digit; RR/manufacturer/serial split—no TIA lookup; browser-only. Useful when the same row uses a different identifier ruleset.
  • E.164 phone normalize — Strip formatting, normalize + / 00 / 011, validate ITU-style length; NANP +1 hint for 10-digit US/CA style—local only. Useful when the same row uses a different identifier ruleset.

Common use cases

  • IMSI format check for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

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