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Your phone could easily wait until it's on wifi to upload 24hrs worthy of ambient voice data (which is only trigged by voice activation, so not a full 24hrs)...

The feds have been using cellphones as full-bore wiretaps since the early 2000s when they used it on mobster's "dumbphones". I'm sure they've figured out clever exfiltration techniques on smartphones by now.

Especially considering how willing the ISPs/telecom companies are to bend over backwards to hide surveillance. Even 3g/4g wiretapping is probably feasible.

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