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02 Using Your Mobile Abroad Assignment

Find out your international phone number so you can receive phone calls and texts from abroad.

If you’d like to receive a phone call from someone in another country, you’ll need to convert your UK phone number into an international phone number. The easiest way to do this is to replace the zero at the start of your phone number with +44.

Your International Phone Number

Enter your UK phone number below to convert it into an international phone number:

Please enter your phone number:


Enter a UK number. For instance, 07123 456 789.

Your international phone number is:

+44 [UK number without leading zero]

Your contacts who are calling from another country will also need to add the relevant international direct dial (IDD) prefix in their country. If you’ve already entered your phone number above, the table below will show the exact phone number your contacts will need to dial:

Alternatively, if your contacts abroad are calling you from a GSM mobile phone, they can input the +44 prefix directly into their handset (to get the plus sign, you’ll need to long-press on the zero button in your mobile phone’s dialler).

If you’re using a UK-based SIM card in the UK or Europe, it will always be free for you to receive an incoming phone call (to be clear, there are no additional charges for receiving an incoming international phone call).

If you’re travelling outside of Europe, the normal roaming charges might apply for receiving an incoming phone call.

Frequently Asked Questions

Travelling Abroad

If you’re travelling abroad to another country and roaming on your UK-based SIM card, your international phone number will still remain the same. The +44 at the beginning of your international phone number refers to the fact you have a UK-based number (you don’t necessarily need to be physically inside the UK).

If you’re using a different SIM card when travelling abroad, you may have a local phone number in the country where you purchased your SIM card. In this case, you’ll also have a new international phone number.

For more information and for useful tips about using your mobile phone abroad, please see our in-depth guide to this topic.

Leading Zero

When you convert a UK phone number into an international phone number, you should remove the zero at the start and replace it with +44. A common mistake is to leave the zero in place – this is incorrect and will lead to the phone call failing to connect.

UK phone numbers are sometimes written with the leading zero in brackets: for instance, +44 (0) 7123 456 789. If you see a phone number written in this format, you should remove the zero that’s in brackets to get your international phone number.

Call Costs

Your contacts who are calling you from abroad will need to pay their phone company for an international phone call to the UK.

Typically, a different rate is charged for calls going to a UK landline and to a UK mobile. UK landline phone numbers begin with either +44 1 or +44 2, whereas UK mobile phone numbers begin with +44 7. The interactive tool above will tell you about the type of phone number being called.

If you’d like to call internationally from the UK, see our guide to the best mobile phone networks for international calling.

Visiting The UK

If you’re visiting the UK on a short-term trip, it may possibly make sense to get a UK-based SIM card. If you do this, you’ll be assigned a new UK-based phone number. Any contacts living outside the UK will need to call you on your international phone number (use the form above to find out your international number).

For more information, read our in-depth guide on the best SIM cards for visitors to the UK.

More Information

Ken’s Tech Tips is an independent website helping you to use your mobile phone in the UK. You can read our numerous guides to better understand the UK mobile market and to discover the best value mobile phone deals.

A note about your privacy: The phone numbers you enter on this page never leave your computer. Your phone number is converted into an international phone number locally on your computer, and as such, is never communicated with our servers.

How do I get O2 Travel?

Opting into O2 Travel is easy. Just sign into My O2 and add the Bolt On to your account. Or you can text O2TRAVEL to 23336 and we'll add O2 Travel on to your account. It's free to sign up and we'll only charge you for the days you actually use data, minutes or texts while you're away.

How does O2 Travel work?

O2 Travel is a free Bolt On that you can add to your account if you're on Pay Monthly. You can use it if you're travelling to O2 Travel destinations - take a look below to see which destinations are covered.

For £4.99 in Turkey and selected destinations outside of Europe you'll get all the data you need, plus 120 minutes to make and/or receive calls and 120 texts to use within your travel destination and back to the UK. 

You'll only be charged on the days you use O2 Travel. The daily charge will apply from midnight to midnight local time (based on the capital city of the country you're in) and won't be triggered by receiving calls or texts. Any calls you receive during the day will be included in your 120 minutes daily allowance. If you go over this limit within the same day period, you'll be charged at the standard roaming rates for the country you're in. 

O2 Travel provides a separate allowance of data, minutes and texts to use while you're away. Your standard UK tariff allowances won't be impacted. 


If you go over the daily calls and texts limit, you'll be charged at the standard roaming rates in that country for any additional usage.

Which countries are included?
  • £4.99 a day – The following countries have O2 Travel at £4.99.
    Albania, Anguilla, Argentina, Aruba, Australia, Bahamas, Barbados, Belarus, Bermuda, Botswana, Brazil, British Virgin Islands, Canada, Cape Verde, Cayman Islands, Chile, China, Columbia, Cost Rica, Dominica, Dominican Republic, Ecuador, El Salvador, Greenland, Grenada, Guatemala, Guinea, Guyana, Honduras, Hong Kong, Indonesia, Jamaica, Japan, Madagascar, Malaysia, Mexico, Moldova, Montenegro, Montserrat, Myanmar, Netherlands Antilles, New Zealand, Nicaragua, Panama, Paraguay, Peru, Rwanda, Saint Lucia, South Africa, Sri Lanka, St Kitts & Nevis, St Vincent & the Grenadines, Suriname, Thailand, Trinidad & Tobago, Turkey, Turks & Caicos islands, UAE, Uruguay, USA, Venezuela, Yemen, Zambia.
What does O2 Travel not include?

Your allowances will apply from midnight to midnight local time (based on the capital city of the country you're in). Any unused data, calls and texts won't be carried over to the following day.

If you go over the daily 120 minutes and 120 texts allowance, you'll be charged for any additional usage at the standard roaming rate for your chosen destination.

Premium rate numbers, MMS and non-standard texts won't be included in the daily charge and will be billed at standard rates.

What if I don't want O2 Travel?

If you don't choose our free O2 Travel Bolt On while you're away, you'll be charged for any minutes, texts and data usage at the standard rates for that country.

Your data usage will be capped at £40 (excl. VAT) in Europe, which gets you 50MB of data. Contact us to raise this cap to £120, or to remove the cap completely. 

If you choose to remove the £120 cap, you'll be charged the per-megabyte rate for the country you're travelling in. When you're back in the UK, you can contact us to reapply the cap.

If you're already signed up for O2 Travel and feel it isn't the right service for your usage needs abroad, you can opt out at any time by texting NOTRAVEL to 23336 or you can remove the O2 Travel Bolt On in My O2.

What if I'm on Pay As You Go?

If you're travelling in selected countries in Europe, your allowances and charges will work just like they do in the UK. So if you buy one of our Big Bundles, your minutes, texts and data can be used in the UK and the rest of our Pay As You Go Europe Zone. And for our Classic Pay As You Go tariffs, you’ll be charged in our Europe Zone in the same way as you would be at home. Find out more. 

If you’re travelling to Guernsey, Isle of Man, Jersey, Monaco or Switzerland, you can stay connected with O2 Travel. For the days you choose to use data, you'll only be charged a daily rate of £1.99, which gets you 100MB. Your daily rate will automatically end at midnight UK time, or when you reach your daily data allowance. If you use up your 100MB allowance and want to get more data in the same day, you can text MORETRAVEL to 21300, to get another 100MB for £1.99. You can find information on calling, texting and data usage abroad here.

If you want to opt-in to O2 Travel, just text TRAVELON to 21300 to activate. It can take up to 24hrs to be applied to your account. It's free to sign up and we'll only charge you for the days you actually use data while you're away.  


Alternatively, to opt out of O2 Travel you can text TRAVELOFF to 21300. You'll then be charged our standard roaming rates for calls, texts and data in your selected destination.

If you're travelling elsewhere, or you don't have the free O2 Travel Bolt On for those five destinations, you'll be charged our standard roaming rates for calls, texts and data used in your destination. You can find details of all of our standard roaming rates for Pay As You Go customers here.

Which destinations are in our Europe Zone for Pay As You Go?

Austria, Azores, Belgium, Bulgaria, Canary Islands, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, French Guiana, Germany, Gibraltar, Greece, Guardaloupe, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Madeira, Malta, Martinique, Netherlands, Norway, Poland, Portugal, Reunion Islands, Romania, Saint Barthelemy, Saint Martin, San Marino, Slovakia, Slovenia, Spain, Sweden, Vatican City and UK.

Find out more.

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