When you use yallo, you make calls and surf in the Sunrise network, which offers very extensive coverage in Switzerland.
Sunrise operates a nationwide 4G network in Switzerland (over 95% coverage) and provides 99.9% of the population with the best voice and Internet connections.
To help us optimize our Internet connections, we kindly ask you to download the app from the Sunrise at https://www.sunrise.ch/de/privatkunden/mobil-abos/mobilnetz/mobilnetz-app.html and then register with your yallo number. With this app you can give us feedback anytime and anywhere and have your network tested for coverage and speed.
This data is then collected by us and evaluated accordingly. You will of course also receive feedback from us regarding your network coverage and speed.