I reasonably sure you have to get your phone line from either Swisscom or Sunrise. However any swiss phone company can provide the phone services you and each offers special plans. (i.e. you can select who bills you and whos network will carry your telephone traffic).
Several of the companys are also capable of sending your mobile, DSL, and Fixnet bills as one bill instead of three seperate bills. Until recently only Swisscom could bill you for the Fixed line rental, but that has changed.
One of my clients is TalkTalk (
http://www.talktalk.ch ). I am admittedly biased and I think they are a good deal, but I'll use them as an example of the things they offer and what you might want to look for from other Swiss phone service providers.
- one bill per month containing your DSL, FixNet, and Mobile charges
- detailed billing information, each call is shown
- no fixed monthly fee for your SIM card
- calls between you and other TalkTalk customers are free. This includes your mobile phone to your home or anyone else who is a TalkTalk customer
- 100 MB free data per month on your mobile, plus very low rates for additional data
- low international calling rates
End of commercial now.