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After Brexit took place, UKs mobile operators didnt immediately introduce roaming charges but they are now slowly rolling those. The roaming charges will take location beginning January 2022. O2 and Three are meanwhile going to restrict their reasonable usage caps – the previous will limit the information roaming to 25GB a month while Three is minimizing the limitation from 20GB to 12GB.
For those of you are unaware, the EU has actually banned roaming charges within the EU however it has also introduced a fair use contract where you cant purchase a mobile data strategy in one EU country and use it endlessly in another.
In any case, the EU and the UK will motivate operators to have “transparent and reasonable rates” for roaming.