Hi all. Just back from Thailand which was amazing. Before I went I watched some U tube videos about what to know before going. The most useful tip was eSIMs. You can get local sim but you need to buy and register it and won't be your number. With an eSIM you buy online, download and then switch from normal SIM to eSIM when you arrive. I got 15 days of unlimited data in Thailand for about £20. Was easy to set up. No changing SIM cards. Highly recommend.