The proximity bit will be very useful - except when having one of those 'one way conversations' with wife/mother/GF etc. where you tend to get a bit exhausted 5 mins into your half duplex ear-bashing and start holding the phone at arms length for a bit of respite. Suggest disabling based on inbound CLI for nominated 'significant others' to spare the wider public being exposed to the rant/lecture/stream of consciousness ;-)

@badBoyUK - why? because automation is good. It's much more convenient not to have to say to the caller "hold on a minute while I put you on speaker .." (+ 2 second delay while you then actually do it). I seem to have to do this very regularly these days, now that I have such a capable "phone" that I can use it productively whilst on a call :-)