From 15 June, new EU regulations mean anyone travelling to an EU member country will be able to use their mobile phone minutes, texts and data at the same price as if they were still in the UK.

But exceeding agreed allowances will still incur a charge in the EU and all mobile providers charge different rates, according to campaign group, Which?.

Mobile providers also include different countries in their roaming territories and this can vary depending on whether customers are pay as you go or pay monthly.

For example, O2 pay as you go customers will continue to be hit with roaming charges in the Channel Islands, the Isle of Man, Monaco and Switzerland, while pay monthly customer won’t.

Which? also notes that calls and texts sent from UK mobiles to the EU will still incur charges. The consumer group found that calling Spain from the UK can cost between 9p per minute with Giffgaff to £1.50 with O2.

Alex Neill of Which?, said: “Many will reap the benefits of these changes and will no longer be put off making calls abroad. However, it is important that you take a close look at what is or isn’t included in your current mobile deal. Not knowing what’s included could lead to some surprising charges on your next bill.”