I need 4 handsets (I work from home)
I might consider:
a headset (if I can get one that works)
a phone that vibrates instead of ringing
that thing where it takes all the programmed numbers from the SIM of my mobile
transferring calls internally
I might also have a second line put in (to remind friends/family I am actually at work)
Is there anything else clever phones can do now (apart from the whole speaking to people a long way away)? 