Use gmail and set up a google voice number for both voice and text. The app routes your incomin calls through your iPhone, but uses a random caller and id number. I just delete that call from my history. Outgoing calls do not show up in iPhone history. Just don't allow the app to access your contacts. I'm not sure how it works with an android phone.
Texts stay within the app.
Originally Posted by HornAnt
This is what I have used for years and has worked well for me. A second phone is a pain to hide, keep reloaded and charged. All my hobby apps are hidden and password protected.