The +1664 country code connects you to Montserrat, a tiny British Overseas Territory in the Leeward Islands sometimes called the "Emerald Isle of the Caribbean" for its Irish heritage. Montserrat's story is defined by the Soufrière Hills volcano, which began erupting in 1995 and buried the capital Plymouth under ash and pyroclastic flows. The southern two-thirds of the island remains an exclusion zone. Only about 5,000 people live on Montserrat today, down from 12,000 before the eruption, concentrated in the northern safe zone around Brades and St. John's. As a NANP territory, Montserrat uses area code 664.
Quick answer: Dial +1 (664) followed by 7 local digits. Total length: 11 digits (1 + 664 + 7-digit local number). There is no trunk prefix. Mobile numbers typically start with 492–499. Landline numbers start with 491.
How to call Montserrat: quick reference
Montserrat uses the NANP, so callers from the US and Canada dial it like a domestic long-distance call. From other countries, use your international access code before the full +1-664 number.
| Calling from | Dialing format |
|---|---|
| US/Canada mobile | +1664 [local number] |
| US/Canada landline | 011-1664-[local number] |
| UK | 00-1664-[local number] |
| Australia | 0011-1664-[local number] |
| Germany | 00-1664-[local number] |
| France | 00-1664-[local number] |
Understanding Montserrat phone numbers
All Montserrat phone numbers follow the NANP format: +1 (664) NXX-XXXX, totalling 11 digits. There are no separate area codes — 664 covers the entire island.
Mobile numbers
Mobile numbers use exchange prefixes in the 492–499 range. A typical mobile: +1 (664) 496-1234.
Landline numbers
Landline numbers use the 491 exchange prefix. With such a small population, the number pool is limited. A typical landline: +1 (664) 491-5678.
Number blocks at a glance
| Type | Exchange prefixes | Example |
|---|---|---|
| Mobile | 492–499 | +1 (664) 496-1234 |
| Landline | 491 | +1 (664) 491-5678 |
Mobile carriers in Montserrat
With only 5,000 residents, Montserrat's telecom market is tiny. Two carriers serve the island.
Flow (Liberty Latin America)
Flow is the primary carrier, handling both mobile and fixed-line services. It's the legacy provider (formerly Cable & Wireless) and has the most complete coverage across the inhabited northern zone.
Digicel
Digicel offers mobile services with competitive prepaid plans. Coverage is limited to the populated areas in the north of the island, which is where everyone lives anyway.
Don't confuse +1664 with nearby codes
Montserrat's +1-664 can be confused with other Leeward Islands NANP codes.
| Code | Country | How to tell apart |
|---|---|---|
| +1 (664) | Montserrat | The code you want |
| +1 (268) | Antigua and Barbuda | Closest neighbour, 55 km away |
| +1 (869) | Saint Kitts and Nevis | Another Leeward Island nearby |
| +1 (340) | US Virgin Islands | Different part of the Caribbean |
The main confusion is with Antigua (+1-268), since many Montserratians relocated there after the volcano eruption and the two islands have close ties. Make sure you have the right area code before dialing.
Time zone considerations
Montserrat is on Atlantic Standard Time (AST), which is UTC-4 year-round. No daylight saving time.
| Your location | When it's noon in Montserrat |
|---|---|
| New York (EST/EDT) | 11:00 AM (winter) / 12:00 PM (summer) |
| London (GMT/BST) | 4:00 PM (winter) / 5:00 PM (summer) |
| Toronto (EST/EDT) | 11:00 AM (winter) / 12:00 PM (summer) |
| Tokyo (JST) | 1:00 AM next day |
The UK connection matters most here — many Montserratians were granted British citizenship and settled in the UK after the eruption. The 4–5 hour gap with London is the time difference most callers deal with.
Communication in Montserrat
Business hours
Government offices operate 8:00 AM to 4:00 PM, Monday through Friday. Most businesses follow similar hours. Saturday mornings see some shops open. On an island this small, you can often reach people by calling their mobile directly, even for government matters.
Language
English is the official and everyday language. Montserratian English has a distinct Caribbean accent influenced by the island's Irish colonial history — St. Patrick's Day is actually a public holiday here.
Network coverage
Mobile coverage is available across the inhabited northern third of the island. The exclusion zone in the south has no infrastructure at all. Internet connectivity has improved in recent years, and WhatsApp is commonly used alongside traditional voice calls. Given the island's size, coverage gaps in the safe zone are minimal.
The Montserrat diaspora
Where Montserratians have settled
The 1995 eruption scattered Montserrat's population. The UK absorbed the largest group — the British government granted full citizenship and many settled in London and other English cities. Antigua and Barbuda, just 55 km away, took in hundreds of evacuees who remain there today. Smaller communities exist in the US (mainly New York) and other Caribbean islands. The diaspora now outnumbers the on-island population by a wide margin.
Why they call home
For an island of 5,000, family connections are tight. Everyone knows everyone. Calls between the UK and Montserrat are constant, as are calls from Antigua. The big spikes come around St. Patrick's Day (March 17, a national holiday celebrating the island's Irish heritage), Christmas, and the annual Festival (late December). Many in the diaspora still own land or property in the safe zone and call to coordinate maintenance, check on elderly relatives, or follow reconstruction progress.
Dialing examples
Calling a mobile from the US
Your contact's number is 496-1234. From a US phone, dial: +1 (664) 496-1234. From a US landline: 1-664-496-1234. No international access code needed from within the NANP.
Calling a landline from the UK
The number is 491-5678. From a UK phone, dial: 00 1 664 491 5678. Or: +1 664 491 5678.
Calling from Antigua
From Antigua (also NANP), dial: 1-664-496-1234. It works like a long-distance call within the numbering plan.
Calling within Montserrat
For local calls, dial the 7-digit number directly: 496-1234. No area code needed.
Common mistakes to avoid
Treating it as a domestic US call
Montserrat is in the NANP, so the number format looks like a US number. But it's a British territory in the Caribbean — your carrier will charge international rates.
Confusing with Antigua
Many Montserratians relocated to Antigua after the eruption. If your contact moved, they may now be on an Antigua number (+1-268) rather than a Montserrat number (+1-664). Confirm which number they're using.
Calling old Plymouth numbers
The former capital Plymouth is in the exclusion zone and has been abandoned since the late 1990s. Any phone numbers associated with Plymouth no longer work. Contacts on Montserrat are now in the northern safe zone.
Missing the +1 from outside North America
From Europe, Asia, or elsewhere outside the NANP, you need the full +1 before 664. Dialing just +664 won't connect.
Prefer calling over WiFi? See our guide to the best apps for WiFi calling.
Frequently asked questions (FAQ)
What country uses the +1664 code?
Montserrat, a British Overseas Territory in the Caribbean's Leeward Islands.
How many people live on Montserrat?
About 5,000. The population dropped from 12,000 after the Soufrière Hills volcano erupted in 1995, destroying the capital Plymouth and making the southern two-thirds of the island uninhabitable.
Is +1664 a US number?
No. Montserrat uses the NANP and shares the +1 country code, but it's a British territory. Calls to +1-664 are international and charged at international rates.
How many digits is a Montserrat phone number?
11 digits total: +1 (country code) + 664 (area code) + 7-digit local number.
What time zone is Montserrat in?
Atlantic Standard Time (AST), UTC-4, year-round with no daylight saving time.
Need to call Montserrat or other Leeward Islands? CallSky.io covers 180+ countries with per-minute rates and no subscriptions. Related guides: +1268 Antigua and Barbuda • +1869 Saint Kitts and Nevis • +1767 Dominica.