Vodafone has become the second UK mobile company to reintroduce roaming charges for users travelling in Europe.
It follows similar plans from rival EE, announced in June.
Initially, all operators said they would not reintroduce a roaming charge after Brexit, despite having the option to, BBC reported.
The rules will change for new and upgrading customers from Wednesday, August 11, though the charges will not apply until January.
"Existing customers will not be impacted by these changes while they remain on their current price plan, and roaming in the Republic of Ireland will still be included for all customers," Vodafone said.
Fair-usage limits also apply at 25GB of roaming data a month.