If you don't need a land line then look at the 3g options. There are two advantages. You have it everywhere in Switzerland and second when you move appartment you're not going to be offline between de-connection from one place to the other. 

That being said i don't know how slow things in this respect as I have not had to change address. 

Hi

Thanks for your quick reply any suggestion reagarding vendor's?

Thanks a lot

For the moment I'm happy with Swisscom. 

http://www.swisscom.ch/res/mobile/tarife/surfen-telefonieren/grande/index.htm

If you use your mobile phone as a wifi hotspot. 

http://www.swisscom.ch/res/internet/mobile-unlimited/tarife/index.htm

If your laptop has a sim slot or you have a 3g modem. 

Final option: Ipad

http://www.swisscom.ch/res/internet/mobile-unlimited/tarife-ipad/index.htm

Orange and Sunrise also provide some options.