Phone numbers · GU

Guam phone number format

Guam numbers use the country code +1. A mobile number looks like (671) 300-1234 at home and +16713001234 in international E.164 format.

TypeExample (national)InternationalE.164Digits
Mobile(671) 300-1234+1 671-300-1234+1671300123410
Landline(671) 300-1234+1 671-300-1234+1671300123410
Toll-free(800) 212-3456+1 800-212-3456+1800212345610
Premium-rate(900) 212-3456+1 900-212-3456+1900212345610
Personal (forwarding) number(500) 234-5678+1 500-234-5678+1500234567810
Country calling code
+1
National (trunk) prefix
1
International call prefix
011
Separate VoIP range
No
Time zones
America/Adak, America/Anchorage, America/Anguilla, America/Antigua, America/Barbados, America/Boise, America/Cayman, America/Chicago, America/Denver, America/Dominica, America/Edmonton, America/Fort_Nelson, America/Grand_Turk, America/Grenada, America/Halifax, America/Jamaica, America/Juneau, America/Los_Angeles, America/Lower_Princes, America/Montserrat, America/Nassau, America/New_York, America/North_Dakota/Center, America/Phoenix, America/Port_of_Spain, America/Puerto_Rico, America/Regina, America/Santo_Domingo, America/St_Johns, America/St_Kitts, America/St_Lucia, America/St_Thomas, America/St_Vincent, America/Toronto, America/Tortola, America/Vancouver, America/Winnipeg, Atlantic/Bermuda, Pacific/Guam, Pacific/Honolulu, Pacific/Pago_Pago, Pacific/Saipan
Validate in code

Check a Guam number.

Send the number as typed plus country: "GU". You get it back in E.164 with its line type, ready to store.

Try the free validator →

curl https://veqen-app.com/v1/phone/check \
  -H "Authorization: Bearer $VEQEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"country": "GU", "phone": "(671) 300-1234"}'
import os, requests

r = requests.post(
    "https://veqen-app.com/v1/phone/check",
    headers={"Authorization": f"Bearer {os.environ['VEQEN_API_KEY']}"},
    json={"country": "GU", "phone": "(671) 300-1234"},
    timeout=10,
)
result = r.json()
print(result["risk"]["verdict"], result["risk"]["reasons"])
const res = await fetch("https://veqen-app.com/v1/phone/check", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.VEQEN_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"country": "GU", "phone": "(671) 300-1234"}),
});
const result = await res.json();
console.log(result.risk.verdict, result.risk.reasons);
Questions

Guam numbers

What is the country code for Guam?

+1. Dial it after your international access code, or use +1 from a mobile phone.

How do I format a Guam phone number in E.164?

Drop the national prefix (1) and add +1. For example (671) 300-1234 becomes +16713001234.

How many digits is a Guam mobile number?

10 digits after the country code.

Does Guam have VoIP phone numbers?

There is no separate VoIP range in the numbering plan, so VoIP numbers look like ordinary numbers.

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