If you live close to a border, make sure to select the carrier Swisscom manually in your device settings: https://bit.ly/2vKzgMn
Hope it helps
This happens in the middle of Switzerld, not just near the border. I have turned off roaming to check if I am on Swisscom and the Internet works fine. It even happens on Swisscom wifi
It is essentially unusabe. It can work and then 10 minutes later it stops and says I am abroad
I can forward your request to the technical support.
Please provide the concerned number by private message.