Assuming, as you're from Hong Kong, you have a Hong Kong passport in which case you arrived visa exempt, not visa on arrival. You would have been stamped in for 30 days and that can be extended once by another 30 days at any immigration office for a fee of 1900 baht
but yes, it should. If you have a dual SIM phone though, you can leave both Sims in and turn on the thai one for data use and set the UK one to and call when you want it to. Then you don't have to keep swapping Sims
but don't you just need a text from your UK number initially just to get it set up and then you should be good to go? I don't bank with them myself so can't say for certain but know most others work like that