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Not an assigned area code

077 is not a US area code: here's what it actually is

Reviewed by Sujan ThapaliyaLast updated

What is area code 077?

077 is not a valid North American area code. Area codes never begin with 0 or 1, so 077 cannot be one. If you saw it on caller ID it is either a spoofed number or part of an international number your carrier displayed incorrectly.
Where area code 077 sits in a North American number: the three-digit area code, then the three-digit exchange code, then the four-digit line number, all under country code 1. The diagram also shows the two validity rules — an area code never starts with 0 or 1, and a repeated middle digit marks a service code such as 800 for toll-free rather than a place.
The 1 you dial before a ten-digit number is a long-distance prefix, not part of the number itself.

Area code 077

Type
Not a valid area code
Coverage
Not assigned

Background

About 077

077 is not a North American area code. In the UK, 077 is the start of a mobile number (+44 77…); in Japan and Italy it is a landline area code.

Unwanted calls

Why you are getting 077 calls

The reason an unfamiliar 077 number keeps calling is usually neighbour spoofing: automated systems fake a caller ID in the recipient’s own area code because a local-looking number is answered far more often than an unfamiliar one. The number displayed is frequently not the number placing the call, and may belong to someone with no idea it is being used.

What actually helps:

  • Let unknown numbers go to voicemail. Automated diallers rarely leave a message; a real caller will.
  • Do not press any key to be removed. On an automated call, a keypress confirms a live human and increases the volume you get.
  • Register on the national Do Not Call list and report unwanted calls. It does not stop fraud, but it does constrain legitimate telemarketers.
  • Turn on your carrier’s call-filtering service. Filtering now uses STIR/SHAKEN attestation, which is why properly signed business calls get through and spoofed ones increasingly do not.

If you are calling into 077 rather than receiving from it, the relevant reading is how caller ID and attestation decide whether a call is answered — the same signals that decide whether a call from this code gets answered decide whether yours does.

No one can legitimately have a 077 number

Because 077 is not in service, any call displaying it has manufactured caller ID. There is no subscriber to trace and no carrier to complain to about the displayed number; the useful action is to block it and report the call.

Frequently asked questions

Where is area code 077?
077 is not assigned to any location. No region in the North American Numbering Plan uses it.
Is a call from 077 a scam?
A call displaying 077 is spoofed, because 077 is not assigned to anyone. That does not automatically mean fraud (some legitimate systems display malformed caller ID) but you should treat it with the same caution as any unknown call.
Why did I get a call from 077 if it is not a real area code?
Because caller ID is asserted by the caller, not verified by the network. Anyone can put arbitrary digits in the "from" field of a call, and until STIR/SHAKEN signing is universal there is nothing forcing those digits to correspond to a number that exists. A call showing 077 is spoofed by definition — no carrier has ever been able to assign it to a subscriber.
Can I block 077 calls?
You can block the displayed number, but it will not help much: spoofers rotate the number they display on almost every call, so blocking 077 today just means a different fake number tomorrow. What does work is your carrier's network-level spam filtering, which scores calls on signing and behaviour rather than on the digits shown.
Should I call a 077 number back?
No. There is nothing to call back — the code is not in service, so the number never existed. Returning a call to a spoofed number either fails outright or connects you to whoever now holds a real number that resembles it, neither of which reaches the person who called you.

Sources

  1. North American Numbering Plan Administrator — NANPAArea code assignments, relief planning, and which codes are in service across the North American Numbering Plan.
  2. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

Make your business calls get answered

Owned numbers, branded caller ID, and Attestation A signing on every call: the three things that decide whether your calls get labelled or answered.

  • Branded caller ID (CNAM)
  • STIR/SHAKEN Attestation A
  • No subscription
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