The EU banned roaming fees in 2017 for all its member countries as part of an overhaul of Europe’s telecoms market that was designed to boost growth and innovation.

However, soon after leaving the EU, most of the UK’s networks reintroduced roaming charges as they were no longer beholden to the established rules.

In a new report, MoneySavingExpert.com found that, post-Brexit, mobile users had been left with weaker rights and many with higher costs.

It found that mobile providers no longer need to warn users of roaming costs, provide a monthly cap on roaming fees, or offer protections against inadvertent roaming.

In addition, the report showed that while three of the four major mobile networks now charge for roaming in the EU, different providers use different definitions of a ‘day’ of roaming, leaving consumers at risk of overpaying.

“I’ve no faith in mobile firms to self-regulate. When we left the EU, they promised not to reintroduce European roaming...