Area code 664: Montserrat
What is area code 664?
Area code 664 is an area code for Montserrat, which is part of the North American Numbering Plan but not the US or Canada. It is on Atlantic Standard Time. NANPA lists no overlay code for it. Calls to it from the US and Canada are international calls. Local calls there take 7 digits.
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See the phone add-onArea code 664 facts
| Location | Montserrat |
|---|---|
| Time zone | Atlantic Standard Time |
| Overlays | None |
| Split from | 809 |
| In service since | July 1, 1996 |
| Local calls | 7 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
In short: 664 is Montserrat (Atlantic Standard Time). Format checks here are free and run in your browser; the current carrier and line type need a live lookup. Bulk phone number validator · Pro + Phone plan
Local time in area code 664
America/Montserrat
Prefixes in service
No public data
Administered by the country's own regulator
How do I dial a 664 number?
NANPA's dialling plan for 664: local calls inside the code take 7 digits, toll calls 1 + 10 digits. Montserrat is a separate country or territory inside the North American Numbering Plan, so a call there from the US or Canada is dialled like a domestic one but billed as international. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 664 | 555-0147 |
|---|---|
| From the US or Canada | 1-664-555-0147 |
| From outside North America | +1 664 555 0147 |
| E.164, for CRMs and SMS tools | +16645550147 |
When did area code 664 start?
Area code 664 went into service on July 1, 1996, split from 809. It has no overlay, so every number in its area still starts with it.
Tools for 664 numbers
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Next step
A 664 number tells you where it was issued, not what it is now.
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Area code 664 questions
- What country is area code 664?
- Area code 664 is in Montserrat.
- What time zone is area code 664 in?
- Atlantic Standard Time.
- Does area code 664 have an overlay?
- Not as of NANPA's file dated 10/16/2026. Every number in its area uses 664.
- When did area code 664 start?
- Area code 664 went into service on July 1, 1996, split from 809.
- Is a 664 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- Does a valid format mean a 664 number is in service?
- No. A format check only says the digits fit the North American Numbering Plan and that 664 is an assigned code. It cannot tell whether the number is connected, who answers it or which carrier serves it today, because numbers are reassigned and ported. A live carrier lookup reports the current carrier and line type, but even that is not proof someone answers.
- Can I check a list of 664 numbers for free?
- Yes. Paste them in the list tab above or upload a CSV to the bulk phone number validator: format, E.164, country and the numbering-plan line type are free for every row, with no account. Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month).
More area codes
664 is the only area code in Montserrat. Browse every area code by state and province on the area code index.
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.