You may be able to if you can meet all the requirements. Samui doesn't issue all of the in-country visas. Let's see what others from the south would say.
Better to contact them directly, it would be the fastest.
That line is misleading, but it has been sitting there for quite a while.
The limit of two times visa-exempt entries per calendar year is applied for land entries only.
You can enter Thailand on the visa-exempt scheme by air theoretically unlimited (practically until the officer gets questions about you being a genuine tourist).
, depends on your local office. Most accept when you have
*****
days or less, so you can go anytime. BUT several offices including Jomtien, Samui, allow you to apply for a tourism extension only within the last week of your stamp. Check your local office along with their requirements.
Q. if I really need to first go to Immigration here to cancel the existing visa, before going abroad to a thai consulate to get the new visa ?
-> Depends on what stamp you are on now.
IF you have already applied for an extension after the first 90 days, yes, you should go to the immigration office that issued your extension to apply for cancellation. Then you need to leave Thailand once. You may apply for a Non-B at the Thai embassy/consulate outside Thailand or at the local immigration office depending on the documents from your employer.
Meanwhile, IF you are still on the first 90 days stamp from your Non-O visa, you just can leave Thailand without cancelling anything.
, You can enter Thailand using both passports when you get a new one when you are out of Thailand.
You are supposed to have the correct documents to stay in Thailand: the right passport with the right permission inside.
The timing of transferring could depend on what you need to do at the local office next. You can go to the office asap. anyway, You must transfer stamps at least before earlier one of the dates of, your next 90-day report or extension application. Even you do both of them in one visit. They have you transfer stamps first, then let you apply for an extension or submit a 90-day report.
We advise people to transfer stamps earlier rather than later.
If you are sure you entered on visa-exempt for 30 days, not on visa-waiver, you can apply for a 30 days tourism extension ONCE at your local immigration office <- that means the office services your current address on your latest TM30 in Thailand.
This is general information for tourism extension, may vary by the immigration office. Check with your local office for their specific requirements.