Heh, nice one. Not that it's my area, but in case the above was not decodable as sarcasm to other readers, following the evidence-based / defense-in-depth strat

Heh, nice one. Not that it's my area, but in case the above was not decodable as sarcasm to other readers, following the evidence-based / defense-in-depth strategies I'd personally recommend not using phones at all (far too little control in general) and instead recommend seeking out auditable (open source) software on actual machines you have a hope to control for secure communications. It's a deep rabbit hole with diminishing returns, though.