This is so quaint: (1) that anything comes with a user manual these days instead of having to guess your way around it and (2) that having got a user manual, anyone would actually take the time to read the thing instead of just blundering about and cursing. Sweet!
The person on the other end of the call can't hear me if I go over 70 anyway so I'm perfectly happy chugging along in my lane on the phone to the missus. I don't consider it unsafe if it's used appropriately. Taking a call whilst hooning round the twistys or filtering through London traffic is just a bit stupid.
Good choices. My helmet Bluetooth doesn't do A2DP (music) so I have Bluetooth headphones for music on the move.
That's half the point. Head banging at the lights when you do stop. Annoyingly, in London, it's always when I've got the music going that some other biker tries to ask me a question about the bike at some traffic lights. I can never hear a word and just mime headphones