This briefing on roaming charges argues that this problem is hugely exaggerated. But it also sets out two options for the Government to prevent consumers facing higher phone bills in a no-deal scenario.

Solutions include:

• Replicate the existing arrangements by retaining restrictions on retail roaming charges in UK law unilaterally. This could be overseen by Ofcom.

• Alternatively, and preferably, they could let market forces do their job. There is now a much weaker case for state intervention in capping mobile phone tariffs. Consumers have alternative options with increased access to wi-fi and they can compare prices of different providers more easily putting those who introduce retail roaming charges at a competitive disadvantage. Given these developments, roaming charges have tumbled worldwide.

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