To get an emergency connection with your smartphone, you need e.g. the Internet-Box 3, if you still have the previous models you can order the IB3 in your Kundencenter at a reduced price.
https://www.swisscom.ch/de/privatkunden/hilfe/geraet/internet-router.html
Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.