@Lausebart 2021 hat das Trinity College mal gemessen

https://www.scss.tcd.ie/doug.leith/apple_google.pdf

We find that even when minimally configured
and the handset is idle ()iOS () share
data with Apple/() on average every 4.5 mins. The phone
IMEI, hardware serial number, SIM serial number and IMSI,
handset phone number etc are shared with Apple ().
Both iOS and Android transmit telemetry, despite the
user explicitly opting out of this. When a SIM is inserted both
iOS and Android send details to Apple/(). iOS sends
the MAC addresses of nearby devices, e.g. other handsets and
the home gateway, to Apple together with their GPS location.
Users have no opt out from this and currently there are few, if
any, realistic options for preventing this data sharing.

Seitdem ist es nicht besser geworden.