For anyone struggling with ESIMs or want to do it the old fashion way for data in Europe....If you buy a Three PAYG sim you get roaming absolutely free as part of the sim (up to 12GB per trip in 71 countries), but if you are on a three contract you have to pay extra for roaming. So PAYG is the way.
Go on Amazon (or any supermarket checkout etc) and buy yourself a PAYG 10GB sim card (as of posting this they are £8.99 on amazon).
DO NOT BUY bigger data sims as Three restrict the amount of data (12GB) for roaming, so if you feel you need more data (I can assure you you will hardly use any for google maps traffic info) then just buy a couple of PAYG 10GB sim cards and chuck away the sim card once you have used all the data up.
Go on Amazon (or any supermarket checkout etc) and buy yourself a PAYG 10GB sim card (as of posting this they are £8.99 on amazon).
DO NOT BUY bigger data sims as Three restrict the amount of data (12GB) for roaming, so if you feel you need more data (I can assure you you will hardly use any for google maps traffic info) then just buy a couple of PAYG 10GB sim cards and chuck away the sim card once you have used all the data up.