6 min read
2026-02-06
Phone numbers have different structures depending on the country and type of service.
The ITU-T E.164 standard defines the format: +[country code][subscriber number]. Maximum length is 15 digits.
| Country | Code | Format | Example |
|---|---|---|---|
| Russia | +7 | +7 (XXX) XXX-XX-XX | +7 (495) 123-45-67 |
| USA | +1 | +1 (XXX) XXX-XXXX | +1 (212) 555-1234 |
| Germany | +49 | +49 XXXX XXXXXXX | +49 30 12345678 |
| China | +86 | +86 XXX XXXX XXXX | +86 138 0013 8000 |
**Country code** — compliance with the E.164 standard
**Number length** — correct digit count for the country
**Operator prefix** — mobile or landline number
**Input format** — correctness of spaces, brackets, and hyphens
Check numbers with the Phone Validator.
See also: Email Validator, IP Validator