Key facts
- COVERAGE
- Guernsey
- NETWORKS
- Sure
- PLAN TYPE
- Data only
- IP ADDRESS LOCATION
- Netherlands if usage is in Europe. Virginia if usage is in the USA
- DELIVERY
- QR code by email
How it works
- 1Choose a plan and pay.
- 2Scan the QR code we email you. You can install it before you fly.
- 3When you land in Guernsey, turn on data roaming for the Spidot line.
Questions about the Guernsey eSIM
Which networks does it use?
Do I get a local phone number?
Can I use it outside Guernsey?
How do I install it?
Will my phone work with an eSIM?
Does my UK allowance work in Guernsey?
Can I use my Guernsey plan in Jersey?
Will I have signal on Sark?
Why did my phone connect to a French network?
Will WhatsApp keep my usual number?
Can I add more data during my stay?
Guernsey eSIM guide: mobile data for travellers
Guernsey is one of the Channel Islands, lying in the Gulf of St Malo much closer to the coast of Normandy than to England. It is a self-governing British Crown Dependency with its own laws, its own currency notes and its own mobile networks. Visitors come for the harbour town of St Peter Port and Castle Cornet, Victor Hugo's Hauteville House, the cliff paths along the south coast, the bays and beaches of the west, and the remains of the island's fortifications from many centuries. Guernsey is also the gateway to the smaller islands of its Bailiwick: car-free Sark, tiny Herm and, further north, Alderney.
Guernsey's status trips up many visitors when it comes to mobile data. A Spidot eSIM gives you a separate data line for Guernsey that you install before you travel, switch on when you arrive and use alongside your own SIM for calls and texts. This guide explains how roaming works for British and European visitors, how much data a short break needs, and what to expect from coverage around the island and on the neighbouring islands.
eSIM, roaming or a local SIM in Guernsey
Guernsey is not part of the United Kingdom and not part of the European Union. That matters for mobile data, because many visitors assume it works like the place they have come from.
UK SIMs
Guernsey uses the pound, UK-style plugs and red post boxes, so British visitors often expect their domestic allowance to work. In practice, UK operators treat the Channel Islands in different ways: some include them in their UK or roaming allowances, others charge separately. Check your operator's terms for Guernsey specifically before you sail or fly.
EU and other SIMs
Because Guernsey is outside the EU, the EU's "Roam like at Home" rules do not automatically apply. A French SIM, for example, may be charged differently in St Peter Port than in nearby Normandy. SIMs from North America and elsewhere follow their operator's roaming terms.
A local SIM or a Spidot eSIM
Local SIMs are available in St Peter Port, but for a short break that is rarely worth the time. A Spidot eSIM sits beside your home SIM as a separate data line. You buy a Guernsey plan online, receive the QR code by email straight after payment and install it at home. Plans start from $5.90. Most plans are data-only, without a local number; for local calls, see our Data + calls plans.
How much data to plan for
Most Guernsey visits are short breaks of a few days to a week. Your data needs depend on how much you share and whether you are working. Rough estimates:
- Maps and walking routes: a few megabytes per hour; very useful on the cliff paths and in the narrow lanes inland.
- Bus times and ferry updates: light.
- Messaging: light.
- Photos and social media: moderate; coastal views and harbour sunsets tend to be shared.
- Video calls: typically several hundred megabytes per hour.
- Streaming: heavy, often a gigabyte or more per hour in HD.
Typical choices
A weekend or a short break fits a small fixed data plan. A longer stay, a business trip or a holiday with plenty of photo and video sharing is more comfortable with a larger plan or an unlimited plan, keeping in mind that speed may slow after heavy use.
People who visit the Channel Islands regularly, for family or business, may prefer a no-expiry plan. You can check how much data is left and add more data at any time.
Before you go
Install the eSIM at home over Wi-Fi. First check your phone supports eSIM and is carrier-unlocked. Then follow the install guide for iPhone, Samsung or Pixel. Label the line "Guernsey", keep your home SIM as default for calls and texts, and set the Spidot line for mobile data.
- Install the eSIM a day or two before you travel.
- Download an offline map of Guernsey; the island is small, so this takes little space.
- If you plan to visit Sark, Herm or Alderney, download those maps too.
- Save ferry and flight booking details offline, as sea and fog can cause delays.
- Turn off data roaming on your home SIM if you do not want it used.
Arriving in Guernsey
Visitors arrive either by air at Guernsey Airport, in the south of the island, or by sea at St Peter Port harbour. Flights link Guernsey with airports in the UK, and with Jersey and Alderney. Ferries connect Guernsey with ports on the south coast of England, with Jersey, and seasonally with France.
When you arrive, select the Spidot line for mobile data and turn on data roaming for it; our data roaming guide shows where. It may take a minute or two to connect.
Arriving by ferry
On the crossing, your phone may lose signal at sea or pick up networks in England, France or Jersey along the way. Keep data roaming off on your home SIM during the crossing to avoid using a network you did not intend to, and switch to the Spidot line as you approach St Peter Port.
From the airport
The airport is a short drive from St Peter Port and the west coast. Buses and taxis are available. With data working, you can check the bus timetable, find your accommodation and message your host.
Coverage around Guernsey and the smaller islands
Guernsey is small and well populated, and mobile data generally works across most of the island, including St Peter Port, St Sampson, the west coast bays and the main roads.
A few places can be weaker:
- South coast cliff paths: the paths between the bays run along steep cliffs, and coves at the bottom of valleys such as Moulin Huet, Petit Bot and Saints Bay may have weaker signal.
- Fortifications and tunnels: inside some underground and fortified sites, expect little or no signal.
- Sark: a small island without cars; coverage is available in places, but expect weaker spots on the cliffs and in the more remote parts.
- Herm: a tiny island reached by a short boat trip; signal can vary around the beaches and paths.
- Alderney: connected by air and sea; coverage is concentrated around St Anne and can be weaker on the coast.
French and Jersey networks
Guernsey is close to France and Jersey, and on the coast your phone may occasionally pick up a signal from across the water. This matters if your home SIM is used for data, because roaming charges would be different. With the Spidot line selected for mobile data and data roaming off on your home SIM, you stay in control. If data behaves unexpectedly, check which network your phone is on.
Sure are among the networks your Spidot plan can use in Guernsey.
Data on buses, boats and walking routes
Guernsey has a bus network that circles the island and connects St Peter Port with the coast and the airport. Bus times are available online, and data lets you check them as you go. Many visitors also hire a car or a bike; lanes are narrow and the speed limit is low.
Boats to Sark and Herm
Boats to Sark and Herm leave from St Peter Port. Sailings depend on the weather and the season, so check the latest information before you go. On board, signal usually holds close to the islands and may drop in between.
Walking the cliff paths
The south coast cliff paths are among Guernsey's highlights. They are well marked, but the many steps and valleys can be tiring. Download your route, check bus times for the return journey, and carry water and a power bank.
Sharing data with a hotspot
If you are visiting Guernsey on business, your phone's personal hotspot can share your Spidot data with a laptop. It uses whichever line is selected for mobile data, so make sure that is the Spidot line.
Laptops use more data than phones. Pause automatic updates and cloud sync before you connect, and check your remaining data during the day.
Using public Wi-Fi safely
Hotels, cafés and pubs often offer Wi-Fi. It is convenient but not always secure.
- Use your eSIM data for banking, card payments and logins.
- Ask staff for the exact network name before connecting.
- Turn off automatic joining of open networks.
- Keep your phone and apps updated.
Practical tips for Guernsey
A few details that are useful to know:
- Currency: Guernsey issues its own pound notes and coins, at par with sterling, and UK money is accepted. Cards and contactless payments are widely used. Guernsey notes are not generally accepted in the UK, so spend them before you leave.
- Language: English is the main language. Many place names are in French or Guernésiais, the island's traditional language.
- Weather and fog: sea fog can delay flights and boats. Keep booking details downloaded and check updates before you head to the airport or harbour.
- Tides: Guernsey has a large tidal range. Check tide times before exploring rock pools or walking to tidal islands such as Lihou.
- Sark without cars: on Sark, people get around on foot, by bicycle or by horse and carriage. Plan your day and download a map before you sail.
- Hedge veg: roadside stalls selling eggs, flowers and vegetables are a Guernsey tradition; they usually work on trust, so carry some coins.
Guernsey on a multi-country trip
Many visitors combine Guernsey with Jersey, the larger Channel Island to the south-east, and arrive from the United Kingdom or France.
If your trip covers several European countries, a Europe plan may be convenient, but check whether Guernsey is on the Europe plan's country list before relying on it here. If it is not listed, combine your Europe, UK or France plan with a Guernsey plan. Both can be installed on the same phone, and you switch mobile data when you arrive.