What are the best eSIM options for UK banking with a Thai number and which phone is compatible?

When seeking an esim for UK banking while living in Thailand, it's important to note that not all banks accept Thai numbers—Halifax does, but Nationwide does not. Many users recommend purchasing a temporary esim, like Airalo, upon arrival in the UK to secure internet access. They usually switch to a more affordable local esim from providers like AIS or TRUE in Thailand. Giffgaff is also suggested as a compatible option for those needing UK numbers.