What Happens to Your Phone Number When You Move Abroad?
Suspension, recycling, hijacked accounts — the full timeline of what happens to an unused SIM after you emigrate, and how to keep your number alive.
Every year millions of people move countries — and most of them lose their old phone number without ever deciding to. Here’s the exact timeline of what happens to a SIM you stop using, and what it takes to stop the clock.
TL;DR: An unused prepaid SIM typically survives 30–90 days, then gets suspended, then recycled to a stranger. Everything attached to that number — bank OTPs, WhatsApp, government logins — breaks or becomes a security risk. Keeping the number alive is cheap; recovering it later is often impossible.
The timeline of a dying number
- Day 0: You land in your new country and put your old SIM in a drawer.
- Day 30–90: Your prepaid validity expires. Outgoing service stops first; incoming calls and SMS follow.
- Month 3–6: The carrier suspends the number entirely. Your two-factor codes now go nowhere.
- Month 6–12: The number is recycled and sold to a new subscriber. If they install WhatsApp, they can see your account. If your bank still sends OTPs there, those codes go to a stranger’s phone.
The exact windows vary by country and carrier, but the sequence is nearly universal.
How long do you have?
Porting rules and timelines differ a lot between countries — check yours:
What actually breaks
People underestimate how much is tied to a single mobile number:
- Banking — most banks worldwide still verify by SMS. Losing the number can lock you out of your own account from abroad.
- Messaging — WhatsApp, LINE, Telegram, WeChat accounts are all number-based.
- Government services — tax portals and digital ID systems often require the registered number.
- Everything else — airline accounts, delivery apps, crypto exchanges, old subscriptions.
Keeping the number alive
You have three options: keep paying a carrier at home, juggle prepaid top-ups remotely, or port the number to a service built for this. Keep My Number keeps your number real and active — calls and SMS arrive in the app wherever you live — with no validity windows, for less than any postpaid plan.
Whichever route you choose, do it before you move. Porting requires identity verification that’s dramatically easier while you’re still in the country.