This, given these NSA programs have had 10 years to evolve and expand, and that the NSA can easily get access to effectively the entire planets’ mobile devices by showing up to just two American companies’ HQs with guns and gag orders, it seems almost a certainty that they’ll have OS-level access. So I’d highly doubt any standard mobile device is NSA-safe.
In terms of dimensionality, I actually do not think it would physically be possible for the NSA to warehouse all the raw data they could Hoover (haha get it) up, so that might be a bit comforting. And certainly whatever data they do Hoover up will mostly never be directly seen by a human due to physical constraints on eyeball time available to spy vs produce content. That yields one answer to your question which is to just not attract enough attention they decide to turn on full logging and comb through your life
In terms of dimensionality, I actually do not think it would physically be possible for the NSA to warehouse all the raw data they could Hoover (haha get it) up, so that might be a bit comforting. And certainly whatever data they do Hoover up will mostly never be directly seen by a human due to physical constraints on eyeball time available to spy vs produce content. That yields one answer to your question which is to just not attract enough attention they decide to turn on full logging and comb through your life