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by shahzeb 3630 days ago
At least on the iPhone, Siri is only activated by the "Hey Siri" command if your phone is plugged in to charge.
1 comments

Only on older hardware. Anything with an A9/M9 (iPhones 6S and SE, iPads Pro) works on battery power as well.
I got around this on my iPhone6 using a battery case :) Nowadays, I just leave it off, though.