Every time I travel internationally I immediately get notifications for Android OS updates. I'm pretty sure they are for satisfying local regulations about the phone's behavior, including the topic at hand.

Interesting. I have never seen anything like that in many years of frequent travelling while using Android. Which countries did you see this in? And are you using stock Android or some vendor's version?

Stock android. Traveling between US, Europe, LATAM and China.

I am not saying there are no backdoors, but this never happened to me.

And I am an Android user since the first G1 phone.

I'm currently abroad with a notification for "November Pixel Drop update available" that appeared the day following my arrival. I believe I had already installed the November update back home earlier in the month. Every time I go back home, a couple of days later I get an update too.

I'm not claiming to know of any foul play, but it has happened several times, enough for me to notice. If it was related to time of the month, it wouldn't be as consistent. It might be that you need specific combination of phone, configuration and network provider for this to happen. Maybe I've been p0wnd, but I've noticed this behavior since at least the Nexus line.

Anecdotal. Why wouldn't they deliver these via Play Services update? It's easy to dismiss an OS upgrade, background updates can't be really blocked.

This has never happened on my iPhone

Apple charges a storage tax so why not ship all that data by default

Every other OEM charges a "storage tax" too?

They are just done in the background?

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