Safer than leaving the handlebars to push the button on the microphone...
Especially with winter gloves.
Anyway, for the Italian law, it is allowed to drive with earphone (only one ear), but only if it does not require the use of the hands. So I can drive listening the phone ringing, or I have to transgress the law.
Or can I set the DND mode, that is the same of turning off the phone.
I'm not sure, but I think that other phones (Iphone?) have this function.
For developers: is it so hard to write a W10 application intercepting incoming calls and answering after 3 or 4 rings?