Under EU rules, the cost of making calls, sending messages or using the internet on your phone in the EU is the same in the UK.
If the UK leaves without a deal these rules will no longer apply - however, some UK companies have said they may continue to offer this benefit to their customers. Before you travel, check with your mobile phone provider about the costs of using your phone in the EU.
For more information please visit - https://www.gov.uk/guidance/uk-nationals-travelling-to-eu-essential-information.
The UK Government has launched a ‘Get Ready For Brexit’ campaign - further details can be found here.