Plus, anything to avoid O2! Their roaming data rates are horrendous, plus 4G is no where near as good as EE for example.
Perhaps still not as good as EE, but they're not so bad these days. Obviously EU roaming is free anyway. However the other week I noticed I now have "O2 Travel Inclusive Zone" showing up on my tariff which includes free roaming in quite a few non-EU countries like the USA, Australia, New Zealand etc. Quite good to know that I now won't get stung for £5 a day whenever I'm in the USA. List is here: https://www.o2.co.uk/international/travel-inclusive-zone