Seychelles. Oh how lovely. Tbh if I was to go there a phone would be the last thing I’d want. Enjoy you holiday Exiled.
I'm with sky, £2 a day to use your data, great, buuut, just been on a cruise Sailed from Dubrovnick, in Sky's approved countries. Next stop Montenegro, o dear, forgot to turn phone off, not in roaming agreement, hit my spend limit of £45 in no time at all just with a few texts and emails down loading and apps running in the back ground plus a couple of phone calls. Didn't make that mistake again. Make sure you set a very low spend limit just to make sure.
First thing I do when I buy a new phone is set it to zero. Then, whenever/if ever I do need it, I can change it there and then.