Money Saving Expert Martin Lewis has warned millions of Brits could be stung with a daily £6 charge if they're not careful. The finance journalist issued a warning to people after rules changed.
Thanks to Brexit, Brits visiting EU countries will no longer be immune to roaming charges on some networks. Mobile firms were previously banned from charging extra fees to use your UK allowance - calls, texts and data - while holidaying in the EU.
But because of Brexit, mobile providers are now able to charge people for using their phones abroad, and if you're not careful, it could prove very costly. EE describes a day use in the EU as anything up to 11.59pm UK time, the same day. So if you sign up at 11.58pm, you would only get a minute's worth of data for your money.