Source note · E.164 numbering and dial string normalization
ITU-T E.164 limits an international telephone number to at most 15 digits, counting the country code but not the international prefix.
Checked 2026-09-23
ITU-T specifies that a phone number cannot be longer than fifteen digits
- Vendor
- ITU-T
- Product
- Recommendation E.164
- Subsystem
- number length
- Deployment
- standard
- Region
- not restricted
- Release range
- edition not established
- Checked
- 2026-09-23
Sources
- Falsehoods Programmers Believe About Phone Numbers — Google · tier 3 vendor-maintained repositories · Falsehood 16: All valid phone numbers follow the ITU specifications
Cite this note
APA
WarmTransfer. (2026, September 23). E.164 numbering and dial string normalization: source note e164-numbering-max-15-digits. WarmTransfer. https://warmtransfer.net/knowledge/claims/e164-numbering-max-15-digits
BibTeX
@misc{warmtransfer-claim-e164-numbering-max-15-digits,
title = {E.164 numbering and dial string normalization: source note e164-numbering-max-15-digits},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/e164-numbering-max-15-digits},
note = {Source note e164-numbering-max-15-digits, checked 2026-09-23}
}