The steps below matter most in the first ten to thirty minutes, ideally from another device — a friend's phone, a laptop, or a computer at wherever you are. Speed matters more here than almost anywhere else on this site, because a phone often holds live sessions for email, banking, and authenticator apps that a thief can use immediately.

Do these first, in order

If Find My Phone wasn't set up beforehand, this is exactly why it's worth enabling in advance — reviewed in our smartphone security guide. It can't be turned on remotely after the fact.

Within the first day

The takeaway

A lost or stolen phone is a race against how quickly someone else can act on the access it holds. Locking or wiping it, ending active sessions remotely, and suspending carrier service — done fast, from any other device you can borrow — closes the window before it becomes a bigger problem than the phone itself.

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