We wanted to get a UK or European SIM card in London (flying into Heathrow). We'll be spending a week in London and another week in Paris and don't want to be charged extra for EU roaming in France using a UK SIM card. I heard many companies used to allow free EU Roaming but Brexit changed that. Any recommendations for good SIM card packages to get in London that would also work in Paris?
I don't know anymore - the carrier policies are constantly evolving. Some UK mobile operators are starting to charge roaming surcharges if roaming in the EU.
Lots of info/details here:
Currently EE still allows EU roaming on its pay as you go plans. Check under the good to know section for the list of countries. They have shops throughout London. I went to the one near Covent Garden. Reasonable price vs many US carriers.
Lebara uk, Giffgaff and Lyca uk still offer eu roaming. There might be a few more.
They all offer 5g in UK. Lebara offers 5g while roaming sometimes, such as in Germany.
The other carrier might offer the same, but I haven't used them.