I use vonage which gives you UK landline no and allows you to call most countries for free provided the call is to a landline even though you are in Switzerland. What I love about it is that you can take it with you anywhere you go provided you can connect to the internet. It uses VOIP. http://www.vonage.co.uk/ . You have different tariffs, the minimum been £5.99 a month. You get voicemail and can redirect your calls to another no including mobile phones, so you never miss a call.