Get a physical Sim not at the airport for AIS. If you don’t have dual sim, do an eSIM for your home country provider and insert the Thai AIS for data, Line and WhatsApp use. I have this and for three years it works awesome. Can make monthly payments at any AIS store and I have left for two months, came back, paid worked fine.
I have never been asked when I had it. Probably because they saw I had it! When I returned one way on a retirement visa they questioned it until I showed the visa.
I use google map, check before starting out and it will find the fastest route. It can change throughout the day depending on construction etc. it will even give an option to revise a faster route on the way.