A word of advice, if I may. As with mobile phones,probably anywhere in the world, there are no signal zones(dead spots) and the highlands of Scotland have more than their share.When driving around, if the call is important, when you find a signal, find the nearest safe place and STOP to make the call. It may be many miles before you are back in the signal zone. Secondly, it is illegal to drive and use a mobile phone, even stopping to talk on the mobile with the engine running is illegal. It is alright for the passenger to talk on a mobile though, whilst moving and assuming you can keep the signal. I must add that I am not sure of the legal position with "hands free" mobile phones and driving.