Will immigration accept mobile departure tickets or do they need to be printed in Thailand?

The general consensus among the commenters is that immigration in Thailand is unlikely to ask for printed departure tickets, as they often accept mobile versions. While airlines may require proof of return tickets during check-in, it appears that showing tickets on a mobile phone is usually sufficient. Some participants suggest having a printed copy as a backup in case of phone issues, particularly since airline staff may insist on seeing exit tickets before boarding.