EE will start charging new customers more to use their phone in Europe as of January 2022.
It means those who join or upgrade from 7 July 2021 will need to pay a daily fee to use their normal allowance on the continent.
The news comes after the operator, which is part of BT Group, said there weren't any plans to bring the charges back for UK customers visiting Europe.
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Back in January, four of the major phone operators in the country said they wouldn't be bringing roaming charges back, despite the Brexit trade deal giving them the option.
But it is the first UK operator to bring them back since the EU trade deal was signed.
Networks were banned from charging customers more to use their phones in EU countries in 2017, but fair use limits have applied throughout.
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The daily charge will be £2 for data roaming in the EU. However, the network did stress that the charges will not apply to customers from the UK who are visiting the Republic of Ireland.
An EE spokesperson said: "This will apply only to new and upgrading customers signing up to EE from the 7th July 2021 and will support investment into our U.K. based customer service and leading U.K. network."
But it's believed others may follow.
As reported by The Independent, Ernest Doku, from consumer comparison site Uswitch, said in a statement: "In the aftermath of Brexit, the UK's biggest mobile providers all said that they had no immediate plans to change their charging models for consumers roaming within the EU.
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"It's hugely disappointing for consumers to see that situation change so quickly.
"Unfortunately, when one provider makes such a bold decision it can mean that others follow, so we'll be watching to see what O2, Vodafone and Three do next."
Customers will be able to buy passes for 30 days so they can use their normal tariff abroad, but the cost of this will depend on which tariff they are already on.
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O2 was reported to have changed its rules, but it hasn't introduced extra charges. Instead it has brought in a fair use data cap of 25GB a month.
These limits were allowed when the UK was still in the EU, and from next month, Three will reduce its fair use limit from 20GB a month to 12GB.
The UK's trade deal with the EU says that both sides will ask networks to have "transparent and reasonable rates" for roaming. Charges are not banned though.
Featured Image Credit: PA