FORMAT
Does it look valid?
Checks the digit count and allowed prefixes for the selected country. US and Canadian area codes are checked against a list.
Check that a number fits the format of its country, and see its country and, for the US and Canada, its region. It checks the format only: not the carrier, and not whether the number is in service.
The checker applies the numbering rules built into this page. It does not query carrier databases, so it can tell you four things, and some of them only as a hint.
Checks the digit count and allowed prefixes for the selected country. US and Canadian area codes are checked against a list.
Shows the country, and the city and state for US and Canadian area codes.
For some countries the prefix shows a mobile range. Otherwise the line type is shown as Unknown. It cannot detect VoIP numbers.
Not available. The checker cannot tell which carrier a number is on, or whether it is active.
Or paste the number with the country code already attached (+1, +44, +91).
Paste or type the phone number into the input field.
The result shows whether the format is valid, plus the country, region (US and Canada) and a line-type hint where the prefix allows one.
Every country has its own numbering plan with digit counts and allowed prefixes. Here are the rules this checker applies for some of the countries in its list.
Most invalid results fall into one of four categories. Understanding why helps you fix the number or flag it as fake before it causes problems.
Every country has a fixed digit count. India requires exactly 10, the US exactly 10, the UK exactly 10 after dropping the leading 0. Extra or missing digits are an instant fail — the most common error when copying numbers manually.
Numbering plans reserve specific starting digits. Indian numbers cannot start with 1–5. US area codes cannot start with 0 or 1. A number that starts with a digit the plan does not use is not a valid number for that country.
Regulators allocate number blocks to carriers in batches. This tool does not check allocation, so a number can fit the format and still not be assigned to anyone. Treat a valid format as necessary, not sufficient.
A number saved without its country code — 9876543210 instead of +91 9876543210 — will fail if the country selected does not match. Always include the country code or select the correct country from the dropdown.
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