Find out how to use your cellphone in the UK if you’re visiting or moving to the United Kingdom.

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

In this article, we’ll discuss cell phone compatibility on UK cellular mobile networks. We’ll also compare the two different ways of using your phone in the UK: roaming on your domestic SIM card or getting a local SIM card in the UK. Finally, we’ll compare the best value pre-paid SIM cards for both visitors and for people moving to the UK.

Cell Phone & Network Compatibility

Network Frequencies & Bands

  • EE
  • O2
  • Three
  • Vodafone

In the UK, there are four cellular coverage providers: EE, O2, Three & Vodafone. Between them, the four providers each cover about 99% of the UK using GSM (2G), WCDMA (3G) and LTE (4G) technologies.

There are also a number of MVNOs (virtual network operators) that piggyback on coverage from one of cellular coverage providers.

The four coverage providers use the following bands and frequencies:

Cellular Coverage Provider 2G Coverage Bands 3G Coverage Bands 4G Coverage Bands
EE GSM 1800 WCDMA 2100 LTE bands 3, 7 & 20
O2* GSM 900 WCDMA 2100 LTE band 20
Three WCDMA 2100 LTE bands 3 & 20
Vodafone* GSM 900 WCDMA 2100 LTE bands 7 & 20

* Both O2 and Vodafone also have some limited coverage on GSM 1800 and WCDMA 900 (available in selected areas only).

In order for your phone to work in the UK, it will need to support at least one of the above frequencies. Most modern cellphones should at least support 2G and 3G in the UK (with the exception of CDMA-only handsets). Some will also support 4G coverage in the UK (but this will depend on the model of your handset and where you purchased it).

If you’re unsure about the bands/frequencies supported by your cellphone, you should consult your handset manufacturer’s documentation.

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 pick up a local SIM card from one of the UK mobile networks.

If you’re only visiting for a short amount of time & only want to make occasional phone calls or text messages, roaming on your domestic SIM card may be the best value option. In advance of travelling 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 (sometimes, you may need to ask for it to be switched on).

If you’re planning to stay in the UK for a little bit longer or if you full access to the mobile internet when you’re travelling around the country, it may be worthwhile getting a local UK SIM card. This will probably be more convenient and cheaper than roaming on your domestic SIM card. In the UK, prices start from about £10 for one month’s usage on a local SIM card (this will also cover any usage in other European countries). You’ll get a UK-based phone number (beginning with +44).

Getting a UK SIM Card

In the UK, it’s a straightforward process to pick up a pre-paid SIM card. All you need to do is to order a free SIM card online, or you can pick one up in person for a minimal cost. There’s no need for you to be a UK resident and there’s also no need to provide any ID when ordering your SIM card. Your cellphone will however need to be carrier-unlocked for it to accept a SIM card from UK networks.

At present, we’d strongly recommend giffgaff as the best SIM card for anyone visiting or moving to the UK. The reason for this is because they provide free international delivery and because they also allow you to top-up with a non-UK credit card or debit card (most other networks will require you to use a UK-based card).

giffgaff

  • Free international delivery & top-up using international credit/debit cards.
  • £10 top-up buys: 500 minutes, unlimited texts and 3GB internet.
  • Uses the O2 network. 99% coverage, 3G & 4G internet, check coverage here.

Giffgaff GoodybagsOur recommended pre-paid network for anyone visiting or moving to the UK is giffgaff.

One of the UK’s most popular cellular network brands, giffgaff is unique in offering free international SIM card delivery. This means you can have a SIM card on your doorstep before you even leave for the airport. giffgaff also allows you to top-up with an international credit or debit card (most other networks currently require you to have a UK-based credit or debit card).

On giffgaff, a £10 top-up will give you 3GB of 4G data along with 500 UK minutes and unlimited UK texts. You can also get low-cost international phone calls from the UK to other countries and you can tether at no extra charge (so your mobile internet connection can be shared with other people or other devices). You’ll also get unlimited free calling to other giffgaff members and you can use the SIM card in Europe at no extra cost.

For customers wanting a larger allowance of data, giffgaff charges £12 for 4GB, £15 for 6GB, £18 for 9GB and £20 for Always-On data.

Order giffgaff SIM card (Free) →

giffgaff uses O2 as a network coverage provider so will work on any handset supporting GSM 900, WCDMA 2100 or LTE band 20.

If you’re not able to order a SIM card from giffgaff in advance, you can also pick up a SIM card in-person when you arrive in the UK.

If possible, I’d strongly advise against getting a SIM card at the airport (e.g. at Heathrow or Gatwick). This is because SIM cards at the airport are grossly overpriced. Instead, wait until you get into town and make a visit to the nearest cell phone store, grocery store or gas station (mobile phone shop, supermarket or petrol station in the local lingo). If you’re buying a SIM card in-person, you should expect to pay about £1 for the SIM card plus £10 for the initial top-up. Our guide to Pay As You Go SIM cards will give you a full overview of the available options.

As a word of warning, it’s worth noting that most UK networks will not allow you to top-up remotely using a card registered outside the UK. Therefore, unless you’re on giffgaff or another network that specifically supports international top-ups, the only way for you to top-up will be in-person at locations showing the green ‘top-up’ logo (shown on the right).

At the end of your trip to the UK, it’s worth holding on to your SIM card. Typically, your pre-paid SIM card will remain active for about 6 months after the last usage of your SIM card. Therefore, if you’re planning to visit the UK again on a future trip (as we hope you will!), you may be able to re-use your SIM card on that occasion.

Note on Pay Monthly deals: If you’re moving permanently to the UK, you may be tempted to get a Pay Monthly SIM card on contract. In order to get a Pay Monthly contract, you’ll need to be a UK resident and you’ll need to undergo a UK credit check. You’ll also need a UK bank account against which your Direct Debit payments can be made. Unless you’ve lived in the UK for a certain amount of time, we’d always recommend getting a pre-paid deal like giffgaff which requires no credit check.

Using Your Phone In Europe

If you’re combining your trip to the UK with a trip to mainland Europe, you can continue to use your pre-paid SIM card there at no additional cost. There is no need to get a separate SIM card in each country you’re visiting, particularly with the advent of Roam Like Home legislation.

You can use your UK SIM card at no extra cost when travelling to one of the following EU countries: 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), Republic of Ireland, Romania, Slovakia, Slovenia, Spain (includes Canary Islands and Balearic Islands) and Sweden. Likewise, if you already have a SIM card from one of these EU countries, you should be able to use it in the UK at no extra charge.

If you’re travelling to Guernsey, the Isle of Man, Jersey, Monaco or Switzerland, you should read the article here for information on whether it’s covered by your network.

Some networks also go beyond roaming in Europe. For instance, a pre-paid SIM card from Three in the UK can also be used at no extra cost in countries like the USA, Australia, Brazil, Singapore and more.

Other Useful Information

Terminology

In the UK, cellphones are known as ‘mobile phones’.

In the UK and Europe, the cellular industry tends to use slightly different terminology to North American countries and some other countries around the world. Namely:

  • Cellphones are typically referred to as ‘mobile phones’ in day-to-day usage.
  • Carriers or cellular networks are more commonly referred to as ‘mobile networks’ in the UK (or ‘mobile phone networks’ to give them their full name).
  • Instead of re-filling or re-charging your prepaid plan, we typically just refer to topping-up your Pay As You Go account.

When shopping or comparing price plans, it’s also worth being aware that prices in the UK already include VAT (sales tax).

International Dialling

If you’re using a UK SIM card, you’ll be assigned a new UK-based phone number on the SIM card. The phone number will be 11-digits long and will start with 07 (e.g. 07123 456 789). If your friends or family would like to call you from outside the UK, you’ll need to replace the zero at the start with +44 to get your international number (so, for instance, 07123 456 789 would become +44 7123 456 789).

Similarly, if you’re calling abroad from your UK phone number, you should add the relevant international calling code 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 services. The pan-European emergency number (112) should also work when you’re in the UK.

If you’re looking to get connected to the internet without using your cellular data connection, many locations now offer free wi-fi (including coffee shops, grocery stores, train station and more). The main providers are BT Wi-Fi, O2 Wi-Fi and The Cloud (there’s more information here on how to get connected).

For getting around, it’s worth being aware of 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 in London whilst National Rail Enquiries covers rail travel across the UK). You can also use Google Maps for transit directions, as well as CityMapper in major urban areas.

We hope you have a fantastic time in the UK and a very enjoyable trip!

Your Comments 218 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 218 comments from readers. You can add your own comment here.

  • Thank you Ken for an informative page. Giffgaff only delivers free SIM card within the UK. Tried typing foreign address and not recognized. I’m flying into Manchester next week to meet up with my sister. I read there is free WiFi withing the terminals so I can manage with Skype to call her so we can find each other. After that, we will pick up a rental car. Is Giffgaff only available online or is it available at grocery stores etc? If not, what would be the next best choice? I’ll be in the UK for 5 days. Will be using data more than voice. Need to search addresses on Google maps.

    • Hi Trevor,
      Many thanks for your comment. giffgaff will allow you to order SIM cards to outside the UK. Typically, they’ll only allow this if your computer is based outside the UK (or you can visit the alternative order form here which will allow you to order a SIM card to an address outside the UK).
      It is now also possible to get a giffgaff SIM card in some UK grocery stores (however, availability is still a bit more limited than some other major networks).
      Ken

      • Hi Ken,

        Thank you for the link. According to the webpage, shipping outside of Europe will take 5+ business days. That’s cutting it too close for me as we don’t have Saturday delivery.

        Will check out the vending machines at MAN airport. I can wait till I get into the city and buy one at some store.

  • Hi Ken,

    Thank you so much for sharing information regarding the various mobile plan. I will be traveling to Europe (arriving in Amsterdam then to Germany, Italy and then back to Amsterdam) for about 18 days. I will need data plan as I need to stay connected to my office during my travels and also to plan my travels. So do I pick either between Go Sim or Mobile Viking or buy separate SIM cards when I arrive and top up as I go along? Please advise what is the most cost effective way and convenient way to go about it?
    Thank you very much,
    Esther

    • Hi Esther,
      Many thanks for your comment. Unfortunately, I wouldn’t be able to advise you on Dutch SIM cards as I have absolutely zero knowledge of that market (this website is mainly focussed on UK mobile networks). One thing that’s worth noting however is that all pan-European roaming should be free on EU-based SIM cards. Therefore, you can just pick up a SIM card in your country of arrival and use it for the entirety of your trip.
      Hope this helps,
      Ken

  • Hi Ken,

    I have an unlocked Samsung S4 Mini which appears to be compatible with all the LTE bands in the UK. Once I purchase and install the SIM card in SIM2 slot is there anything else I need to do in order to use the phone for GPS, calls, internet and SMS texts?

    Regards,
    Dennis

    • Hi Dennis,
      Many thanks for your comment. No, there probably isn’t very much else you need to do to get your phone working in the UK! In some cases, you’ll just need to accept the carrier settings which will be sent to you when you power on your SIM card (if this doesn’t work, you may also need to manually input the APN settings). In most cases, however, I’d expect it to just work without any problems!
      Hope this helps,
      Ken

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