7 months later
Hello, recently had the same question:
To change the PHP version on the Swisscom platform, proceed as follows:
Swisscom login (Anschluss independent products) Marketplace
My business apps (light gray bar)
Web hosting (your product and domain is displayed) For domains and websites
Websites (manage your websites)
You see your website with the service: Linux/Apache, to the right select edit, a sitebar opens.
Under the Linux Apache Settings menu, change the tab to Advanced, where you can then see and change the PHP versions