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Before cancelling your old phone number, identify every important account that uses it for sign-in or recovery. Arrange the new provider’s practical requirements separately. A planned move is a good time to check that losing one SIM would not also lock you out of banking, email and immigration correspondence.
Why the authentication method matters
The US Federal Trade Commission explains that a SIM-swap attacker can receive texted verification codes after taking over a phone number. It recommends an authenticator app or security key when available, while noting that text or email verification is still preferable to no second factor if those are the only options. US Federal Trade Commission: Use Two-Factor Authentication To Protect Your Accounts.
Use a two-number transition sheet
Do not record passwords or recovery codes in the sheet. Its purpose is to show which account needs attention and which official recovery instructions you still need to read. Keep the old service’s cancellation terms beside the switching plan so that the administrative and access tasks stay connected.
| Account group | Current dependency | Planned check |
|---|---|---|
| Old number used for recovery | Add and verify an available recovery method | |
| Bank | Text codes and fraud alerts | Ask bank how an overseas number change works |
| Immigration account | Sign-in or contact number | Read authority's update instructions |
| Mobile contract | Renewal and notice dates | Confirm cancellation and final billing terms |
Walk through the lost-phone scenario
Illustrative exercise: imagine the old SIM stops receiving messages on your arrival day. Can you still reach your accommodation details, email and the provider’s support number from another device? Identify the account you could not recover and read its official recovery guidance before travel. Do not repeatedly change sensitive banking settings while following a stranger’s unsolicited support call.
Close the transition deliberately
After making an account change, use that service’s normal confirmation process and retain its acknowledgement. Ask the local phone company about identity registration, activation and contract terms rather than assuming another migrant’s package is available to you. The goal is a documented transition, not storing every sensitive account detail in one easily shared file.
Keep the next action in your moving planner. For the country-specific authority, use our destination directory.