Hi next week I will fly to Surat Thani with Thai Air,do I need any kind of negative tests?Is the vaccination certificat in the mobile phone enough or do they need it printed?

No tests required at all (by the rules).

They might ask for a vaccination certificate but haven't heard that it is still checked. No print, mobile OK.

I have done two trips this year without anything being checked.

Mask on any time, no onboard service was still in effect.

 

Just looked up again and even no more official word about checking vaccionation certificate.