> The default on iOS is to not send any telemetry data to Apple.

This is actually the default on Android. I showed a specific case of data acquisition that iOS does that you can't opt out of. On Android, that data acquisition is opt-in.

I'm not aware of any use of differential privacy on the Android platform.

And who cares about AGPS. Your cellular provider who is the only one who has access to AGPS data can already track your location based on cell tower information.

IOS uses positioning based on cell towers and Wi-Fi access points, so if your phone has its location services active Apple can tell that a device with a specific ID is near a certain location. This ID is rotated periodically and not linked to your device or to you but you can’t turn this off.

AGPS means the phone downloads the GPS almanac, the dynamic dataset you need for using GPS, from the internet as opposed to watching the satellites for about 30 minutes to download it. That would be stupid and would not have any positive impact on your privacy.

> Your cellular provider who is the only one who has access to AGPS data

And Apple on iOS.

> I'm not aware of any use of differential privacy on the Android platform.

Android itself doesn't need it. It collects less data than iOS. If you're talking about apps on Android that use differential privacy, there are plenty, and their implementation of differential privacy is better than Apple's. https://www.macobserver.com/analysis/google-apple-differenti...