Check whether a Guam number is valid, detect its line type, and convert it to E.164, international, or national format — instantly and free. Powered by Google's libphonenumber.
| Country | Guam (GU) |
| Country calling code | +1 |
| Example number (international) | +1 671 300 1234 |
| National format | (671) 300-1234 |
| E.164 format | +16713001234 |
| RFC 3966 (tel: URI) | tel:+16713001234 |
| Example line type | fixed line or mobile |
To dial a Guam number from abroad, start with the country code +1 followed by the national subscriber number. In E.164 — the format every SMS gateway, CRM, and payment provider expects — the same number is stored as +16713001234: a leading +, the country code, and the national number with no spaces or separators.
The interactive tool above runs entirely in your browser. For server-side validation at scale — sign-up forms, lead cleaning, SMS routing — call the API. One GET request, no SDK, works in any language.
# Validate a Guam number via the API curl "https://phone-validation-and-formatting.p.rapidapi.com/v1/validate?number=%2B16713001234" \ -H "X-RapidAPI-Key: YOUR_KEY" \ -H "X-RapidAPI-Host: phone-validation-and-formatting.p.rapidapi.com"
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The country calling code for Guam is +1. A full number in international (E.164) form looks like +16713001234.
A typical Guam fixed line or mobile number is written +1 671 300 1234 internationally, (671) 300-1234 nationally, or +16713001234 in E.164 format.
Send one GET request to the Phone Validation API with the number and country code "GU". The response tells you whether it is valid, the line type, and every standard format. A free tier is available.
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