eSIM for Guernsey
Land connected in Guernsey. Pick a plan below - it activates in seconds, no physical SIM, no roaming fees.
Best eSIM plans for Guernsey
Three travel data plans that suit most trips to Guernsey, or see the full list of Channel Islander eSIMs below.
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Your Guernsey eSIM guide
How to install your Guernsey eSIM in 3 steps
Getting set up before you cross the water means you arrive in St Peter Port already online, with no queue at a local shop and no hunting for a SIM tray tool.
- Buy your plan and get the QR code. Pick a Guernsey data plan starting from £3.92, and the QR code lands in your inbox within minutes, ready for any eSIM-compatible phone.
- Scan and install before you fly or sail. Open your phone's mobile network settings, choose "Add eSIM" or "Add Cellular Plan", and scan the code over Wi-Fi - the profile installs itself in under a minute.
- Land and switch on data roaming. Whether you arrive at Guernsey Airport or by ferry into St Peter Port, enable data roaming for the new line and it will pick up a local Sure, JT, or Airtel-Vodafone signal on its own.
Your original SIM can stay in place for calls and texts if you want to keep your home number reachable - the eSIM only needs to handle data, and once it's installed you generally won't need to touch the settings again for the rest of your trip, whether you're based in town or heading out to Herm or Sark.
Coverage in Guernsey
Guernsey is served by three networks: Sure, one of the main operators, alongside JT and Airtel-Vodafone. Between them, coverage is near-nationwide across the populated parts of the main island, and St Peter Port - the capital, harbour, and main arrival point for most visitors - has consistently strong signal for calls, data, and everyday browsing around Castle Cornet and the town centre.
Away from the main island, things look different. Sark and Herm are car-free and reached only by a short ferry from St Peter Port, around 20 minutes each way, and both currently run on 4G rather than 5G. Alderney, the more nature-focused of the smaller islands, sits in a similar position, with 4G as the everyday standard for now. A 5G rollout is underway through 2026: JT has begun switching on sites around St Peter Port, Sure is working toward wider 5G access on the main island, and Sark and Alderney are expected to follow later in the year as new masts go up across the island group.
One quirk worth knowing before you arrive: Guernsey sits close enough to the French coast that phones near the water, particularly along south-facing shorelines, can briefly lock onto a French mobile network instead of a local one. This isn't a fault, just geography, but if it happens, toggling airplane mode off and on again usually reconnects you to Sure, JT, or Airtel-Vodafone.
How much data do you actually need?
Guernsey plans come in a few sizes, and matching one to how you'll actually use your phone - whether you're mostly in St Peter Port or island-hopping to Herm and Sark - saves you either running out mid-trip or paying for data you never touch.
| Usage style | Typical daily use | Suggested plan |
|---|---|---|
| Light | Around 300 MB/day - messaging, maps, and occasional browsing around town | 1GB / 7 days |
| Moderate | Around 750 MB/day - social media, music, ferry timetables, and photos from days out | 3GB / 30 days or 5GB / 30 days |
| Heavy | 1.5 GB+ per day - video calls, streaming, and constant navigation between islands | 20GB / 30 days |
eSIM vs roaming vs a local SIM in Guernsey
Because Guernsey is a British Crown Dependency rather than part of the UK or the EU, standard UK "roam like at home" allowances and EU roaming rules generally don't extend here - it's worth checking with your home carrier whether Guernsey is actually included before you rely on it.
| Option | Cost | Setup | Best for |
|---|---|---|---|
| eSIM (local Guernsey plan) | From £3.92 | Install by QR code before you travel, no ID or in-person registration | Most visitors who want data ready the moment they land |
| Home carrier roaming | Often £2-£6 per day, billed as international since Guernsey sits outside UK/EU roaming rules | Automatic, but easy to leave switched on by accident | Very short stopovers where convenience matters most |
| Local physical SIM | Roughly £11-£26 for the SIM | Bought in person from a Sure or JT shop, valid ID required at sale | Longer stays where a Guernsey phone number is useful too |
Practical connectivity tips
- If your phone shows a French network near the coast, don't worry - it's Guernsey's proximity to France causing an unintended pickup, and cycling airplane mode usually fixes it.
- Confirm with your home carrier before you fly whether Guernsey is treated as UK roaming or international - since it's a Crown Dependency, plenty of "UK-wide" allowances quietly exclude it.
- If you're island-hopping, remember Herm and Sark are car-free and ferry-only from St Peter Port, so download any maps, tickets, or ferry timetables you'll need while you still have strong main-island signal.
- Keep an eye on data use if you're heading to Alderney or Sark, since 4G is still the standard there while 5G rolls out first around St Peter Port.
- For calls or texts to emergency services anywhere on the island, 999 and 112 both connect you, and there's a dedicated SMS option for anyone who can't take a voice call.
Travelling beyond Guernsey?
- Also visiting Jersey - get connected on the other main Channel Island before or after your Guernsey stay.
- Continuing on to the UK mainland - line up a separate UK eSIM, since Guernsey roaming rules don't carry over.
- Crossing over to France - handy if your phone's already been flirting with French networks from the Guernsey coastline.
All Channel Islander eSIM data plans
5 plans from £3.92. Prices include VAT, shown in GBP.
Not sure how much data you need?
Tell us your trip length and how you'll use your phone, and we'll point you to the right plan.
Or one plan for the whole trip - regional plans that include Guernsey:
Local info for Guernsey
Top destinations in Guernsey
Explore the best Channel Islander destinations and stay connected.
Guernsey travel guides
Planning the trip itself? Our guides cover what to see, when to go and how to stay connected.
Frequently asked questions about eSIMs for Guernsey
Will my phone accidentally connect to a French network in Guernsey?
It can happen. Guernsey sits close enough to the French coast that phones near the water, especially on south-facing shores, sometimes lock onto a French mobile network instead of Sure, JT, or Airtel-Vodafone. It isn't a fault - it's simply line-of-sight to nearby masts across the water. If you notice a French carrier name on your screen, turning airplane mode off and on again usually reconnects you to a local Guernsey network.
Does my UK or EU roaming plan cover Guernsey automatically?
Not necessarily. Guernsey is a British Crown Dependency, not part of the UK or the EU, so it falls outside standard UK domestic roaming allowances and EU roaming rules. Some home plans do include it and some don't, so it's worth checking with your carrier before you travel rather than assuming your usual allowance applies once you land.
What emergency number should I use in Guernsey?
Dial 999 or 112, both of which work on the island. There's also a dedicated SMS emergency service on 07781 105538 for people who are deaf, hard of hearing, or speech-impaired, allowing them to text for help instead of calling.
Do I need ID to get a SIM card in Guernsey?
Yes, if you buy a physical SIM in person from a Sure or JT shop you'll typically need to show valid ID at the point of sale, with SIMs usually priced around £11-£26. An eSIM installed before you travel skips this entirely - there's no ID check or in-store registration required.
Is there mobile signal on Herm and Sark?
Yes, both islands have 4G coverage, though as smaller, car-free islands reached by a roughly 20-minute ferry from St Peter Port, their networks are more modest than the main island's. 5G is expected to reach them later, after the main island and St Peter Port are further along in the rollout.
Is 5G available yet in Guernsey?
It's arriving gradually. 5G is beginning to roll out around St Peter Port, with the operators working toward broader access on the main island. Sark and Alderney are scheduled to get 5G later in the rollout, so 4G remains the everyday standard there for now.
Which network has the best coverage in St Peter Port?
Sure is one of the main operators, with JT and Airtel-Vodafone also operating locally, and all three give solid coverage around the capital, harbour, and Castle Cornet area. An eSIM plan draws on local network infrastructure automatically, so you don't need to pick a single carrier yourself.
How do I get from St Peter Port to Herm or Sark, and will I have signal on the ferry?
Both islands are reached by a short ferry, around 20 minutes from St Peter Port. Coverage can dip mid-crossing since Herm and Sark are smaller and less built up than the main island, but signal typically returns once you're within range of either island's coastline.
Is an eSIM enough for a short trip, or should I get a local SIM in Guernsey?
For most visits, an eSIM covers everything you need without a shop visit or ID check. A physical local SIM makes more sense if you're staying long enough to want a Guernsey phone number, since buying one in person from Sure or JT does require valid ID at the counter.
Why is roaming so expensive in Guernsey compared to other places?
Because Guernsey sits outside both UK domestic roaming and EU roaming rules, UK and EU carriers typically charge international rates here, often £2-£6 a day, rather than treating it like a home network. A local eSIM plan, starting from £3.92, is generally the cheaper route for anyone spending more than a day or two on the island.
The connectivity details on this page (networks, coverage, local SIM rules, prices and any numbers) are provided for general guidance and can change. Please confirm current details, especially emergency numbers and registration requirements, with official local sources before you travel.
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