I bought this because I was fed up with rubbish Bluetooth kits and it seems to be the nearest thing to the old Nokia 'cark' hands free systems.

It only really makes sense if you can get a duplicate sim otherwise you'll have to take yours out of you're phone every time you get in the car. Orange business services do something called 'single number' which can set the m930 as priority handset, if it's not available it calls the secondary handset (i.e if the m930 is turned off) it will route the cal to you're normal mobile.

Installation was quite straight forward and consisted of routing the microphone ad antenna, and 4 wires, 12v constant, 12v switched, ground and radio mute, Budget for 2 hours labour if getting done at an auto-electrician

The sound quality is great, the best of any car-phone solution I've ever used, no echo whist stationary, and still clear at 80 on the motorway. Feels very solid too.