Can Police Track My Phone's Location?

Your phone constantly creates a record of where you have been — and the question of who can see that record without a warrant was settled, in your favor, in 2018.

What the Law Says

In Carpenter v. United States (2018), the Supreme Court held that the government generally needs a warrant to obtain your historical cell-site location information (CSLI) — the trail of location points your phone leaves with your carrier. The Court recognized that this data is extraordinarily revealing: in Carpenter’s case, the government pulled nearly 13,000 location points over 127 days, effectively mapping his every move.

That kind of detailed, long-term tracking is a Fourth Amendment search, so police usually must get a warrant based on probable cause. The same logic generally applies to real-time location pinging.

An Everyday Example

Police suspect you of a crime and want to know everywhere your phone has been for the past month. Under Carpenter, they cannot simply request that history from your carrier — they generally need a judge-approved warrant first.

The Exceptions

The protection is strong but not absolute. In a genuine emergency — like an active threat to life — case-specific exceptions can allow access without a warrant. And Carpenter was specifically about sustained location history; isolated, short-term information may be treated differently.

What This Means for You

Your location history is protected: police generally need a warrant to track where your phone has been. That single ruling put one of the most revealing kinds of personal data behind the Fourth Amendment’s warrant requirement.