As long as "all other people", as in people you interact with on a day to day basis, use apps/tools without a sufficient crypto, you might aswell accept that you are being monitored . Even if you can prove that the phone itself is "clean" - what about all the traffic you send and receive e.g. over your carrier network? So the only proofing there is, is strong end to end crypto - and there should at least be android apps for that.