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I only have one or two friends who have an Android, the rest are all iPhone.

Only time I use WhatsApp is when I’m traveling overseas.

You are the exception, not the rule. Google for iPhone marketshare.

It seems iPhone is the majority in the US... which countries in Europe do not have a high number of iPhone users?

Except for the UK, All of them have Android dominance.

Is there a breakdown of Android versions and devices? I’m curious to see how current/capable those devices are.

I don't know anyone is publishing that much details but for the overall market share kind of stats you can start digging from statcounter, France for example: https://gs.statcounter.com/os-market-share/mobile/france