How do I transfer my phone number to a new phone after the old phone was lost?
Answer
Contact your mobile carrier to move the number to the new phone’s SIM or eSIM. If you stay on the same carrier, activation is usually enough; if you change carriers, you will need a number transfer (port) with the old account’s transfer PIN.
Before you start: stop right away if…
- Erasing a lost phone can remove data that was never backed up; lock first if you still need recovery options.
Follow these steps
Secure the lost phone if possible
From another device, open Find My Device / Find Hub (Android) or the equivalent Apple Find My page, mark the lost phone as lost, and erase it only after you are sure you do not need a last backup.
You should see: The lost phone is locked or erased remotely, reducing misuse risk.
Confirm carrier and SIM type on the new phone
Check the new phone’s settings or tray for physical SIM versus eSIM support, and decide whether you will keep the same carrier.
You should see: You know which activation method the carrier should use.
Activate or port the number with the carrier
Contact your carrier’s official support or store. Ask them to activate your existing number on the new phone’s SIM/eSIM, or start a port if you are moving to a new carrier.
You should see: The carrier confirms the number is assigned to the new device or that the port is in progress.
Test calling and messaging
Restart the new phone, confirm signal bars appear, then send a text and place a call to verify the transferred number works.
You should see: Calls and texts work on the new phone using the original number.
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Extra tips
What to look for: Whether the new phone will stay on the same carrier, and whether it needs a physical SIM, eSIM, or both.
Before you change anything: Have your carrier account login, account PIN, and the new phone’s IMEI ready. If switching carriers, request the transfer PIN from the old carrier first. Use Find My / Find Hub to lock the lost phone before the number moves, if you still can. Do not share carrier codes with unexpected callers.