How to Keep Your Thai Number While Living Abroad
Moving away from Thailand doesn't have to mean losing your Thai phone number. Here's how porting works, what it costs, and how to keep your number active from anywhere.
Your Thai phone number is more than ten digits. It’s your banking OTPs, your LINE account, your PromptPay, and the way friends and family reach you. Move abroad without a plan and all of that can quietly break within months.
TL;DR: Thai numbers stay active only while the SIM sees activity. If you leave Thailand long-term, you either keep topping up a prepaid SIM forever, pay for a postpaid plan you barely use — or move your number somewhere it stays active by design. That third option is what Keep My Number does.
Why Thai numbers expire
Thai carriers (AIS, True, DTAC) run prepaid SIMs on validity windows. Each top-up extends your number’s life, typically by 30–90 days. Stop topping up, and the number enters a grace period, gets suspended, and is eventually recycled — sold to someone else. If your banking and LINE are still attached to it, that’s not just inconvenient, it’s a security problem.
Postpaid plans don’t expire the same way, but paying ฿300+ every month for a SIM sitting in a drawer abroad adds up to thousands of baht a year for nothing.
How porting works in Thailand
Number porting (MNP) lets you move your number between carriers — or to a service like ours — while keeping it exactly the same for everyone who calls or texts you.
For Thailand specifically, you’ll need your ID (passport or Thai ID) matching the number’s registration, and the port completes in a few business days. Numbers registered to someone else — common with SIMs bought informally — need to be re-registered to you first at a carrier shop.
Your three real options
- Keep topping up from abroad. Works, but you must remember every validity window, keep a way to top up internationally, and hope the carrier doesn’t change its rules. One missed window and the number is gone.
- Switch to postpaid and keep paying. Reliable, but expensive for a number you only need for OTPs and the occasional call.
- Port the number to Keep My Number. Your number stays real and active — receiving calls and SMS in our app wherever you live — for a fraction of a postpaid plan, with no validity windows to track.
Before you leave Thailand: a checklist
- Confirm your number is registered in your name (dial 151 on AIS, or visit a carrier shop).
- Update your banking apps to your email as a backup contact where possible.
- Start the port before you fly — ID verification is much easier in person.
- Once ported, test an incoming OTP from your bank while you still have local access.
Losing a Thai number from abroad is painful to reverse; some banks require an in-person visit to change your registered number. Ten minutes of setup before your flight saves you a trip back.