There are lots of things to read about this on the Internet and you will not find a definitive answer, I'm afraid. My conclusions are based on parsimony not on explicit proof. Besides, we all know how hard it is to prove a negative. It's a complex topic with many black-box elements and those tend to lend themselves to conspiratorial thinking.

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Some articles of interest:

Test showing negative results (Wandera)

Tests showing the phones are capable of much monitoring (Medium)

BBC Coverage of the question

ABC deep dive (10 mins) (Australian)

Gizmodo - is your phone listening?

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