In December 2014 comparis.ch wrote that the three mobile networks in Switzerland were about equal, although there are areas where one is better than the other. You might wish to click on the maps linked below to determine whether there is a better provider for your area:
"The German specialist magazine "Connect" has been testing Swiss mobile networks for six years. In past years, there used to be major differences among the providers. This year, however, these differences are negligible.
Swisscom scores best with 456 out of 500 points. Sunrise gets 442 points and Orange almost as much with 441 points. "Connect" rates all three Swiss providers as "very good".
Nevertheless, there are places in which one provider may be better than another.
This is how you can find out whether a provider offers good network coverage: Coverage maps Swisscom
all offer network coverage maps on their websites. This allows you to check what the reception is like in specific places (e.g. at your home or office) with each provider. On these maps, the providers distinguish between the different network technologies such as 4G/LTE, 3G/UMTS/HSDPA and, except for Orange, also 2G/GSM. Owners of a device without 4G/LTE do not benefit from 4G/LTE coverage.
By the way, M-Budget customers use the Swisscom network, Coop customers the Orange network and Aldi customers the Sunrise network." https://en.comparis.ch/telecom/mobil...g-schweiz.aspx