Should I print my approval email before flying back to Thailand, or is it enough to show it on my phone?

When reentering Thailand after obtaining a visa, it is strongly recommended to print a copy of your visa approval email. While some travelers have successfully used their phones to show the email, many have reported needing a paper copy to avoid complications with immigration officers. It's advisable to carry printed documents to prevent issues that may arise if your phone is lost or malfunctions.