using mobile phone apps for bitcoin (even with hardware wallet) is insecure, but worse still,  its useless for privacy. I don't understand why anyone would encourage users to use android/ios to manage their bitcoins. I would not trust such people.  Its unnecessary, costly, and risky, you can't even airgap a phone without a soldering iron.  Convenience and security do not mix.  Add to that the recent scandal around push notifications. Just no. Stick to free open source methods. So many companies trying to profit from convenience, knowing full well they are sacrificing your privacy and security.