O2

Thanks for your help but I ended up buying an ESIM for data only from a USD company and it seems to have worked.

Ok. Next problem is that to top up online it asks for postcode. I'm from Canada and it won't accept our post code

I tried calling the # above from Switzerland and the call wouldn't go through.

I think I have enough data to last me till end of trip but would like to add the travel add-on which is 1.99/day. do I just add the minimum top up of 10 British GBP?