//Hey all.. editing based on the fact that many of these docs are outdated.//
I’m attaching a sticky not from here that tells you how to check what your phone number is, according to your carrier. Seems to be a small issue for some people. Just FYI, folks.
Thai Immigration website: [members only]
TLDR : Answer Summary
The post provides information on how to find out one's phone number according to the specific carrier in Thailand, referencing a sticky note and mentioning the Thai Immigration website for further details.