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

If 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 with UK cellular mobile networks. We’ll compare the two different ways of using your cell phone in the UK: either roaming on your normal domestic SIM card, or using a local SIM card that’s been purchased in the UK. Finally, we’ll compare the best value prepaid SIM cards that are available for tourists, visitors and new residents to the UK.

Cell Phone & Network Compatibility

Network Frequencies & Bands

  • EE
  • O2
  • Three
  • Vodafone

In the UK, there are four companies providing cellular mobile coverage: EE, O2, Three & Vodafone. Each of them offers about 99% population coverage across the UK using 2G (GSM), 3G (WCDMA & HSPA) and 4G (LTE) technologies. In addition, 5G coverage (NR) is now available in lots of 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 LTE bands 3, 7, 20, 1, 38 2100MHz 1800MHz
O2 5G NR Band n78 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 “core bands” are shown in bold, whereas “additional bands and frequencies” are shown in italics. For your cellphone to work on UK networks, we’d recommend that it supports at least the core bands and frequencies for the type of coverage you’d like to use.

In addition to the four cellular coverage providers, there are a number of mobile virtual network operators (or MVNOs for short). These MVNOs “piggyback” on signal from one of four cellular coverage providers. Major examples include giffgaff (which uses coverage from O2) and VOXI (which uses coverage from Vodafone). On MVNOs, you’ll get the same coverage as on the underlying provider, but often at a lower price point or with additional features.

If you’re not sure about the bands and frequencies supported on your cellphone, you should consult your handset manufacturer’s documentation or product specifications.

Roaming VS Using A UK SIM Card

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

If you’re only visiting the UK for a short amount of time, roaming on your domestic SIM card can often be the simplest 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, or if you’re likely to use your phone fairly heavily whilst you’re there, it might be worthwhile getting a local UK SIM card. This will probably be more convenient and is usually cheaper than roaming on your normal 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 your cellphone usage when you travel to other European countries. You’ll get a UK-based phone number on your UK SIM card (starting with +44).

Getting a UK SIM Card

In the UK, it’s a straightforward process getting a prepaid SIM card. There’s no need for you to be a UK resident, and you won’t need to provide any identification documents. You do, however, need to make sure your cellphone is unlocked from your carrier before your arrival in the UK.

Where possible, we’d strongly recommend getting your UK SIM card in advance of your arrival. This will give you a wider choice of options and will reduce the need for you to make an unnecessary visit to the shops to get a SIM card. You’ll normally also save money by ordering your SIM card in advance, as well as time as you’ll already have a SIM card that’s charged and ready-to-use.

At present, giffgaff is our recommended SIM card for anyone who is visiting or moving to the UK. Unlike most other networks, they offer international delivery for free on all of their SIM cards. On giffgaff, it’s also possible to register and top-up your SIM card using a credit card or debit card that’s registered outside the UK. This is different from most other networks, which require you to use a UK-based bank card when topping up your SIM card.


  • Free international delivery & top-up using international credit/debit cards.
  • £10 top-up buys: Unlimited minutes, unlimited texts and 9GB data.
  • Uses the O2 network. 99% coverage, 3G & 4G internet, 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 are unique in offering free international SIM card delivery. This means you can have a 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 9GB of data along with unlimited UK minutes and unlimited UK texts. You’ll be able to use the SIM card at no extra cost in other European countries and international phone calls (from the UK to other countries) are available at a small additional cost. You can also tether or use personal hotspot to share your data allowance with other devices.

For customers wanting a larger allowance of data, giffgaff offers 10GB of data for £12, 15GB of data for £15 or 80GB of data for £20. For £25, you can get Always-On data for one month (unlimited downloads with the first 80GB per month at full 4G download speeds).

Order giffgaff SIM card (Free) →

giffgaff uses O2 as their cellular network coverage provider. This means you can use a giffgaff SIM card in 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, it’s also possible to get a SIM card in person after your arrival in the UK.

Where possible, avoid getting your SIM card upon arrival at the airport (e.g. when landing at Heathrow or Gatwick). Although a couple of retailers offer UK-based SIM cards, they’re normally grossly overpriced. Instead, you’ll save money by waiting until you arrive in the city. You can get a 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). Compared to ordering online, you should expect to pay a couple of pounds more to get your SIM card in-person, and then £10 or £15 for your initial top-up or charge. Our full guide to prepaid SIM cards in the UK will give you a full overview of all the available options.

As a word of warning, it’s important to note that most UK networks will not allow you to top-up online or by phone when using a payment card that’s registered outside the UK. Therefore, unless you’re on giffgaff or on another network that supports international top-ups, the only way to recharge your account will be making an in-person visit to locations showing the green “top-up” logo.

At the end of your trip to the UK, it’s worth holding on to your SIM card. Typically, your prepaid SIM card will remain active for another 6 months after the last chargeable usage on your SIM card. Therefore, if you’re planning to visit the UK again on a future trip, it might be possible to re-use your SIM card.

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 do this, you’ll need to be a UK resident and you’ll need to be able to pass a UK credit check. You’ll also need a UK bank account from which your monthly Direct Debit payments can be taken. For this reason, unless you’ve already lived in the UK for a significant amount of time, we’d recommend getting a prepaid deal such as giffgaff which doesn’t require you to pass a UK credit check.

Using Your Phone In Europe

If you’re combining a trip to the UK with a trip to mainland Europe, you can continue using your SIM card whilst you’re there at no extra cost. This is because of the EU’s Roam Like At Home policy, which will remain in effect until the 31st December 2020 (with a possible extension depending on UK-EU agreement).

Your prepaid UK SIM card can currently be used at no additional cost in the following European 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), the Republic of Ireland, Romania, Slovakia, Slovenia, Spain (includes Canary Islands and Balearic Islands) and Sweden

Likewise, if you have a SIM card from another European country, you can use it in the UK at no additional cost.

If you’re travelling to Guernsey, the Isle of Man, Jersey, Monaco or Switzerland, you should check whether your usage there will be covered by European roaming.

Some UK networks go beyond inclusive roaming in Europe. For instance, a prepaid SIM card from Three can be used at no extra cost in 71 destinations. This includes the USA, Australia, Brazil, Singapore and more.

Other Useful Information


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

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 or comparing price plans, it’s also worth knowing that taxes are already included in the price. In the UK, this mainly 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 on the SIM card. The phone number will be 11-digits long and will always start 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 becomes +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 and 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.

If you’re travelling to the UK during the Coronavirus (COVID-19) outbreak, you may need to self-isolate for 14 days upon arrival. This is unless you’re arriving from an exempt country. You’ll also need to provide your journey and contact details in advance by submitting it on the GOV.UK website. Guidance and regulation is continually changing in this area so you should check the GOV.UK website before your trip.

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 9GB of data, with 99% UK population coverage.

With most other carriers, you’ll need to get your SIM card in-person from a retail store in the UK. You may also need to top-up your SIM card in a retail store as it may not be possible to top-up online using a bank card that’s based outside the UK.

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 like the one from giffgaff. You can order and activate this 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 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 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 359 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 359 comments from readers. You can add your own comment here.

  • Hey,
    Voxi is currently offering a discount so I was considering getting that. Do you know if they offer payment with non-uk cards?

    • Hi Iqra,
      Thanks for your comment. As far as I know, giffgaff are the only network to “officially” support payment using non-UK cards. I’m not sure whether VOXI is set up to allow this, though do let me know if you try it out and find out whether it works!

  • Hi Ken,
    I will move to the UK as an international student soon and would like to use giffgaff. I don’t have any online payment system from where I am now. How could I get the Sim card? Obviously, I badly need the local sim card as soon as I arrived in Heathrow Airport.

    • Hi Kebede,
      Thanks for your comment. Are you able to use a debit card, credit card or PayPal? giffgaff accept all of these options for topping your SIM card, and you can use a card that’s based outside the UK. If you’re unable to access any of these payment methods, you’ll need to top up in person when you arrive in the UK.

  • Rene Jacinto said:

    Hello Ken,

    Thank you for the article as it has been informative. I had a question pertaining to dual/eSIM capability with an iPhone 11 Pro. Do you know if I purchase a plan through Giffgaff, would I be able to activate that plan and still receive phone calls/text messages to my Verizon phone number? My idea behind this is that I can still receive calls and messages to my Verizon line and if I need to get in touch with the person who contacted me I would call them back using my Giffgaff cellular plan or other means of calling such as Whatsapp, Wifi Calling, etc.

    Thank you,

    • Hi Rene,
      Thanks for your comment. Unfortunately, giffgaff don’t provide eSIMs so you’ll need to use them on the physical SIM card slot on your iPhone 11 Pro. Whether you can use Verizon as the second SIM card would therefore depend on whether they’ll allow you to get a line on eSIM. If so, then yes, it should be fine to use both giffgaff and Verizon at the same time on your iPhone 11 Pro 🙂

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