Re: Cell phone tracking

On Wed, 16 Jul 2025 02:09:07 +0200, Carlos E.R. wrote :

On 2025-07-15 21:47, D wrote:

On Tue, 15 Jul 2025 17:04:48 +0000, Anonymous <nobody@yamn.paranoici.org> wrote:

Message-Id: <20250715.170448.c5f8b4a9@yamn.paranoici.org>
>
I just heard an engineer describing how phones are doing something new
now in tracking people.  Some phones today (probably android and apple)
are continuing to track you after you turn the phone off and store the
data on your phone.  When you turn them back on, the phone then sends
the tracking data to a server.  The only way to defeat this is to put
your phone into a faraday bag, most that don't work.

 
This is ridiculous.

I care about privacy, but I don't understand "tags" nor "findmyphone"
tracking yet, mainly because I haven't ever thought about using them.

However, what little I do know is that the iPhone 11 and later, excluding
some SE models have a feature that allows them to be located even when
turned off or when the battery has run out. This is because they have an
Ultra Wideband chip and a "power reserve" feature for the Find My network.

This means that even if you turn off your iPhone 11 or newer, it can still
act as a relay for an AirTag's location, and its own location can be seen
in the Find My app. Wikipedia says it's five hours after the battery dies.
 <https://en.wikipedia.org/wiki/Find_My>

Android phones have their own "Find My Device" network for locating lost
Android devices but as far as know, they won't work if the phone is off.

All this can be wrong, but there is "some" truth to the fact that an iPhone
that "appears" to have a dead battery, can still participate in finding it.