I've tried all three of the main players, and they are all pretty bad :-(
- price - too high, esp. for roaming in EU, expensive sim cards
- customer service - usually dismal after the sale has been made
- reception usually pretty average, except for Swisscom
I would say try to avoid any kind of lock in plan. If you have your own phone try for a prepaid first to see how it goes, if you stay on a prepaid long enough there are incentives to upgrade to a plan. At that point you will better understand the service quality.
Be warned, there is no consumer protection body in Switzerland, and there are usually hidden condition in the contracts (eg: 3 month cancellation notice period in a 12 month contract).
The French plans are really cheap and good quality ... but they don't roam in Switzerland. There are also some other smaller companies (yello, migros), but I think they all run off the Swisscom backbone.
Jan 9, 20 15:53