After leaving the EU, UK operators are not obligated to offer free EU roaming. Some operators like O2 still offer it; others like EE charge daily fees. Always check with your provider.
Inter-Zone Agreements
No formal EU–UK roaming agreement exists post-Brexit. Roaming between EU/EEA and UK depends entirely on individual operator decisions. Some UK operators (O2, Virgin) voluntarily continue free EU roaming; others (EE, Three) charge daily fees of £2–5/day. EU operators vary widely in their UK roaming terms.