number porting is just moving a phone number from one company to another. Like if you switched from T-Mobile to Verizon and you wanted to keep your number for example
third is the way, it's either great for me so far but LINE of all things eventually detected it as a voip number and locked me out of my account. That was a stressful day.
2 land borders are allowed per year. "Unlimited" air entries.
I actually just reread your comment and it sounds like you've only done one land border and probably only spent about 3-4 months in Thailand this year.
I'm no expert but I don't think you'll have any issue crossing into Thailand by bus.
yeah, I think it's only two land border crossings per year. Maybe you'd be okay after the new year but I'm unclear on that. I suspect you wouldn't have any issue if you were to fly in.