there is no such thing as a secure cellphone platform, at least for us non-govt folk. expecting your comms to be secure on a cellphone because you use some app

there is no such thing as a secure cellphone platform, at least for us non-govt folk. expecting your comms to be secure on a cellphone because you use some app is super naive. as dobbsbob points out, your phone is likely ownable/backdoored by (1) the manufacturer, (2) the OS maker, (3) the ISP and (4) the local intelligence services. the best way to keep anything secure as it relates to your phone is to not use it. in fact, keep your phone well away from where you work and have important conversations. there is a reason certain ppl are not allowed to bring their cellphones to work: it's because they're not even remotely secure.