Find out how to use your cellphone in the UK & see the best UK SIM cards for visitors and new UK residents.

Whether you’re visiting the UK on a short-term trip, or moving there longer-term for study or work, it’s easy to use your cell phone on the mobile networks in the United Kingdom.

In this article, we’ll discuss cell phone compatibility on UK cellular mobile networks. We’ll also look at the different ways of using your cell phone in the UK, including through international roaming or using a local UK SIM card or eSIM. Finally, we’ll compare the best value prepaid SIMs that are available for tourists, visitors and new residents to the UK.

Best UK SIM Card: giffgaff
Recommended Plan: £10 (~US$12.90) for 20GB data & unlimited UK minutes
Inclusive Features:
  • Free international delivery: your SIM card can be sent anywhere in the world.
  • No contract, no credit check & no need to be a UK resident.
  • Use your giffgaff SIM card at no extra cost in 37 European destinations.
Network Coverage: 4G & 5G coverage in the UK (powered by O2)
Free UK SIM Card: Get a free giffgaff SIM card →
eSIM Alternative: Get a Lyca Mobile UK eSIM with 20GB data for £5 (~$6.50)

Cell Phone & Network Compatibility

Network Frequencies & Bands

  • EE
  • O2
  • Three
  • Vodafone

In the UK, there are only four companies that provide cellular mobile coverage: EE, O2, Three & Vodafone. Each of them offers 99% population coverage across the UK using 2G (GSM), 3G (WCDMA & HSPA) and 4G (LTE) technologies. In addition, 5G coverage (NR) is available in most major UK towns and cities.

The four cellular coverage providers utilise the following bands and frequencies in the UK:

Coverage Provider 5G Bands 4G Bands 3G Frequencies 2G Frequencies
EE 5G NR Band n78, n28 LTE bands 3, 7, 20, 1, 38 2100MHz 1800MHz
O2 5G NR Band n78, n28 LTE bands 20, 1, 3, 8, 40 2100MHz, 900MHz 900MHz
Three 5G NR Band n78 LTE bands 3, 20, 1, 32 2100MHz
Vodafone 5G NR Band n78 LTE bands 7, 20, 1, 3, 8, 32, 38 2100MHz, 900MHz 900MHz

The most important bands for your phone to support are shown in bold. Most modern cellphones should at least support a couple of UK bands, providing you’re using a device that’s compatible with GSM or LTE technology. Additional bands and frequencies are shown in italics – you may get faster speeds if your phone has support for these bands.

Alongside the four cellular coverage providers, there are a number of mobile virtual network operators (MVNOs). These MVNOs “piggyback” on signal from one of four cellular coverage providers. For instance, giffgaff uses coverage from the O2 network and Lyca Mobile uses coverage from the EE network.

If you’re unsure about the bands and frequencies supported on your cellphone, consult your handset manufacturer’s documentation or product specifications. For instance, you can see a list of 4G & 5G bands supported on the iPhone.

Roaming VS Using A UK SIM Card

There are two ways to use your cellphone in the UK: you can either roam on your domestic SIM card or you can get a local SIM card from one of the UK networks.

If you’re only visiting the UK for a short amount of time, roaming on your normal domestic SIM card can sometimes be the easiest solution. In advance of your travel to the UK, you should check with your cellular provider on the costs of using your phone in the UK. You should also ensure that international roaming is enabled on your account.

If you’re planning to stay in the UK for a little bit longer, it’s normally worthwhile getting a local UK SIM card. This will probably be more convenient and cheaper than roaming on your normal domestic SIM card. Prices start from about £10 (approx US$12.90) for a prepaid SIM card in the UK, with one month’s usage included in that price. This will also cover your cellphone usage when you travel to other European countries. You’ll get a UK phone number on your UK SIM (starting with +44).

Getting a UK SIM Card

It’s a straightforward process getting a prepaid SIM in the UK. There’s no need to be a UK resident, and you don’t need to provide any identification documents. You will, however, need to make sure that your cellphone is unlocked from your carrier before you arrive in the UK.

Where possible, we’d strongly recommend getting your UK SIM before you arrive. Not only does it avoid an unnecessary trip to get your SIM card from a shop, it can save you a lot of hassle as you’ll have a SIM card that’s charged and ready-to-use. You can also save money when you buy your SIM card in advance.

At present, giffgaff is our recommended SIM card for anyone who is visiting or moving to the UK. Unlike most other networks, they offer free international delivery on all of their SIM cards. You can also activate and recharge your SIM card using a credit card or debit card that’s registered outside the UK. This differs from most other networks where you’ll normally need to use a bank card that’s registered inside the UK.


  • Free international delivery & top-up using international credit/debit cards.
  • £10 top-up buys: Unlimited minutes, unlimited texts and 20GB data.
  • Uses the O2 network. 99% coverage, 4G & 5G speeds, check coverage here.

giffgaff is our recommended prepaid network for anyone who is visiting or moving to the UK.

They’re one of the UK’s most popular cellular network brands and they’re unique in offering free international SIM card delivery. This means you can have your SIM card packed and ready to go before you even leave for the airport. giffgaff will also allow you to top-up online using an international credit card or debit card (whereas most other networks will only accept payment cards from the UK).

On giffgaff, a £10 top-up will give you 20GB of data along with unlimited UK minutes and unlimited UK texts. You’ll also be able to use up to 5GB data at no extra cost every month in 37 European countries. International phone calls from the UK to another country are available at a small additional cost. On giffgaff, you can use tethering and personal hotspot to share your data allowance with other devices.

For customers wanting a larger allowance of data, giffgaff offers 35GB data for £15 or 100GB data for £20. For £25, you’ll get Always-On data (unlimited downloads with 4G & 5G speeds on the first 100GB per month).

Order giffgaff SIM card (Free) →

giffgaff uses O2 (Telefonica) as their cellular network coverage provider. This means you can use a giffgaff SIM card in any phone that supports GSM 900, WCDMA 2100 or LTE band 20.

Alternatively, if you’re travelling to the UK with an eSIM-ready phone (such as the iPhone 11, Galaxy S20, Pixel 3 and later versions of each device), Lyca Mobile offers prepaid UK eSIMs. You’ll get instant online delivery of your eSIM so there’s no need to wait for a SIM card to arrive in the post. Your plan will only begin when your phone connects to a UK network.

Lyca Mobile

  • Instant online delivery via eSIM. Your plan only starts upon arrival in the UK.
  • £5 top-up buys: Unlimited minutes, unlimited texts and 20GB data (for up to 6 months).
  • Uses the EE network. 99% coverage, 4G & 5G speeds, check coverage here.

If you’re looking for the easiest and quickest way to get a local plan in the UK, we’d currently recommend getting an eSIM from Lyca Mobile.

Lyca Mobile’s UK plans start from just £1.99 per month (approx US$2.50). However, for most people, our recommendation is to get the £5 plan with 20GB data (approx US$6.50 per month). This gives you unlimited UK minutes, 100 international minutes, unlimited UK texts and 20GB of 5G data. You’ll also get up to 5GB of data in to use in the EU.

When you order your Lyca Mobile plan online, you’ll need to choose the “eSIM” option at checkout to get instant online delivery by email. You can then pay for your plan using an international bank card or PayPal (there’s no need to have a UK bank account). You’ll be asked to provide the UK address where you’ll be staying after arrival, but the eSIM will be sent to you electronically (unlike a physical SIM card).

Lyca Mobile also offers 5GB data for £1.99 per month and unlimited data for £10 per month.

Order Lyca Mobile UK eSIM (Free) →

In the UK, Lyca Mobile uses EE (British Telecom) as their cellular network coverage provider. This means you can use Lyca Mobile on any eSIM-compatible phone that has support for LTE on band 3, 7 or 20.

If you don’t have an eSIM-compatible phone, Lyca Mobile also offers the option for you to get a physical SIM card. However, this can only be sent out to a UK address. Lyca Mobile does not offer international delivery on their physical SIM cards.

If you’re not able to order a SIM card or eSIM in advance, it’s also possible to get a SIM card upon arrival in the UK.

Where possible, you should avoid getting your SIM card upon arrival at the airport (e.g. at Heathrow or Gatwick). Although there are a couple of retailers that offer UK SIM cards at the airport, they’re normally grossly overpriced. Instead, you’ll save money by waiting until you arrive in the city. You can get a UK SIM card from most cell phone stores, grocery stores and gas stations (also known as mobile phone shops, supermarkets and petrol stations in the local lingo). You should expect to pay a couple of pounds to get your SIM card in-person, plus £10 or £15 for your initial top-up or charge. Our full guide to prepaid SIM cards in the UK will give you an overview of the available options.

As a word of warning, many UK networks won’t allow you to top-up online when you’re using a payment card that’s registered outside the UK. Therefore, unless you’re on a network that supports international top-ups (such as giffgaff or Lyca Mobile), the only way to recharge your account might be to make an in-person top-up at stores showing the green “top-up” logo.

At the end of your trip to the UK, it’s worth holding on to your SIM card. Just make sure you’ve turned off any “auto-renew” settings so you’re not being charged for a UK plan that you’re not using when you go back home. Your prepaid SIM card will normally remain active for another 6 months after the last chargeable use. Therefore, if you’re planning to visit the UK again on a future trip, it might be possible to re-use your SIM.

Note on Pay Monthly deals: If you’re moving to the UK on a longer-term basis, you may be tempted to get a Pay Monthly SIM card. Before you’re able to apply, you’ll need to be a UK resident and you’ll need to pass a UK credit check. You’ll also need a UK bank account from which your monthly payments can be taken. For this reason, unless you’ve already lived in the UK for a significant amount of time, we’d recommend starting on a prepaid deal from Lyca Mobile or giffgaff.

Using Your Phone In Europe

If you’re combining your trip to the UK with a trip to mainland Europe, you’ll sometimes be able to use your UK SIM card at no extra cost in Europe.

On giffgaff’s prepaid SIM card, there’s a fair use limit of 5GB per month in the following European destinations:

Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gibraltar, Greece, Hungary, Iceland, Israel, Italy (includes Sardinia and Sicily), Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal (includes Azores and Madeira), the Republic of Ireland, Romania, Slovakia, Slovenia, Spain (includes Canary Islands and Balearic Islands) and Sweden

Lyca Mobile also offers inclusive European roaming on all of their plans. The fair use limit depends on the plan you choose (e.g. it’s 5GB per month on the £5 plan and 12GB per month on the £10 plan).

Other Useful Information


In the UK and Europe, the cellular industry tends to use different terminology to what is used in North American countries. Namely:

  • Cellphones are normally referred to as mobile phones in Europe.
  • Carriers or cellular networks are more commonly referred to as mobile networks.
  • Prepaid SIM cards are normally advertised as Pay As You Go SIM cards.
  • Instead of re-filling or re-charging your prepaid plan, people normally talk about topping up their Pay As You Go account.

When shopping and comparing plans, it’s worth knowing that taxes are already included in the advertised price. In the UK, this refers to value added tax (VAT), which is similar to sales tax in other countries.

International Dialling

If you’re using a UK SIM card, you’ll be assigned a new UK-based phone number. The phone number will be 11-digits long and will always begin with 07 (e.g. 07123 456 789).

If your friends or family members would like to call you from outside the UK, they’ll need to replace the zero at the start of your phone number with +44. This will give your international phone number (so, for instance, 07123 456 789 would become +44 7123 456 789).

Similarly, if you’re calling abroad from a UK SIM card, you’ll need to add the relevant international calling prefix before dialling out to that number.

Useful Resources

In the UK, the emergency services phone number is 999. This is a single phone number for all emergency services including the police, ambulance and fire service. The pan-European emergency phone number (112) will also work when you’re inside the UK.

If you’re making phone calls on a UK SIM card, your inclusive minutes will normally allow you to call other UK landline and mobile numbers (that’s most phone numbers beginning with 01, 02, 03 and 07). If you’re calling another phone number that isn’t included in this range, find out how much the phone call will cost.

If you’re looking to get connected to the internet without using a cellular data allowance, many locations now offer a free wi-fi connection (including many coffee shops, grocery stores, train stations and more). In the UK, the main providers of public wi-fi are BT, O2, Sky (The Cloud) and Virgin Media.

For getting around, it’s worth using the Transport for London (TfL) and National Rail Enquiries websites. They’re both invaluable for providing you with information on how to get around the UK (TfL covers public transport services in London whereas National Rail Enquiries covers rail travel across the rest of the UK). You can also use Google Maps for transit directions, as well as CityMapper in major urban areas.

Have a smooth trip and enjoy your visit to the UK!

Frequently Asked Questions

What is the best UK SIM card if you’re moving to or visiting the UK?
We’d recommend getting a prepaid SIM card from giffgaff. They offer free international delivery and you can top-up online using a bank card from any country. For £10/month, you’ll get unlimited minutes, unlimited texts and 20GB of data, with 99% UK population coverage.
Will I need to be a UK resident to get a UK SIM card?
There’s no need to be a UK resident to get a prepaid SIM card in the UK. You can order and activate the SIM card online without providing any ID or passing a UK credit check.

If you want to get a Pay Monthly contract, this will require you to be a UK resident. You’ll also need a UK bank account and will need to pass a UK credit check. For this reason, we’d always recommend starting off with a prepaid SIM card. You can change it to a Pay Monthly SIM at a later date, if you like.

Will my cellphone work in the UK?
Your cellphone should work in the UK providing it’s unlocked for use on other networks and providing it supports the following frequencies and bands:
  • For 2G coverage: GSM 900MHz or GSM 1800MHz
  • For 3G coverage: WCDMA/HSPA 2100MHz
  • For 4G coverage: LTE bands 3, 7 or 20
  • For 5G coverage: NR band n78

Your Comments 381 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 381 comments from readers. You can add your own comment here.

  • I followed the advice in this article for 2 phones during a recent visit to England. One phone used a physical SIM and I used Giffgaff, ordering a SIM card well in advance. This worked flawlessly.
    The other phone supported ESIM and I used Lyca. Never got it to work in the UK – no data, no text, no phone service – despite a dozen calls to their help line. When we were in Dover, it picked up France and I finally got data. Total waste of 5 pounds, but at least it was only 5 pounds.

  • Pat Freedman said:

    Thank you for your very helpful article. I have 3 questions about using GiffGaff in Scotland (or other countries):
    (1) Does it allow calling on Wi-Fi?
    (2) How are Whats App calls and messages charged–as regular calls and text messages or as data?
    (3) If I need to receive a text message to my US number for two-factor authentication (for example, from a bank or credit card company), should I remove the GiffGaff SIM and put the Verizon SIM with my US number back in? And then can I switch back to the GiffGaffSIM after I receive the text to the US number?

    • Hi Pat,
      Thanks for your comment.
      1. giffgaff doesn’t offer Wi-Fi Calling at present, though you can of course use a voice-over-IP app such as WhatsApp over WiFi. Regular phone calls will need to be made over the 3G or 4G network.
      2. Any calls or texts made over WhatsApp would simply count towards the download limit on your plan. So additional charges from giffgaff 🙂
      3. Yes – exactly. Unless you have a dual-SIM phone that allows you to use both the Verizon and giffgaff SIM cards at the same time, you’ll need to remove the giffgaff SIM and replace it with your Verizon SIM for you to be able to receive any text messages on your normal US number.
      Hope this helps!

  • Hi.

    Hi, everyone.
    I’m after a quick bit of advice regarding UK sims:

    1. Best ones for whilst back in the UK?
    2. Best ones for when back in Oz, but need to continue using UK number on an infrequent basis?
    3. Best ones for international (AUD) top-up?

    Use case is so that I can continue with accessing my UK bank account on-line (they’re cracking down on UK residency and phone number).

    Any good tips, please?


    • Hi Ed,
      Thanks for your comment. I think giffgaff could be a good option as you can top it up with an international bank card from Australia. Also, you only need to buy a goodybag plan when you’re in the UK. When you go back to Australia, you can switch to traditional Pay As You Go to keep your UK number without paying any regular monthly fees. You can also use it to receive text messages in Australia at no cost.
      Hope this helps,

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