Best taxi to airport? Not all allowed on airport territory?

You’re right, only Grab taxi service is allowed on the airport territory. You can order a car through the application. You don’t need a foreign card for registration, and you can use your country’s phone number, then pay for the trip in cash with baht (or link a bank card if you have one).

Other taxis, like InDrive and Bolt, are not allowed on the airport territory, so they stop nearby – you’ll have to walk about 300 meters. We wrote in detail about transport in Phuket.