If you are coming to Thailand first, look at the AIS network sim, as you can then buy a ontop-roaming package for the other countries, not expensive, and you keep the same number/sim throughout
Can he show deposits (65k+ THB), from a foreign source each month into a Thai bank account for the last year, that maybe an option for showing financials.
once you receive the โonward ticketโ, use it to go onto the official website, ie Qatar Airways was my ticket, input booking ref num-surname etc and email the actual itinerary to yourself with the airline logo on it ๐
No, however, depending on your method of entry (visa exemption stamp) Foreigners who enter Thailand under this Tourist Visa Exemption category may only do so for 30 days at one time with a maximum of 3 times in a 6 month period by flight and 2 times a year for overland crossing.