I do exactly this. I got a cheap feature phone (Nokia, ~50€) with a MultiSIM that my cellprovider offers. Both phones ring at the same time when I get a call, a

I do exactly this. I got a cheap feature phone (Nokia, ~50€) with a MultiSIM that my cellprovider offers. Both phones ring at the same time when I get a call, and I can take it on either. I only have close contacts on my feature phone, it can play music, and I can make calls. Plus, the battery lasts 3weeks in standby, more when you only turn it on when you need it of course. Focus time is now only a matter of taking the right phone with me when I leave the house, or turning the smartphone off for a while. But there are some drawbacks, i.e. I would love for the feature phone to have a better camera.