@Ilkka
thank you for the contribution
>... The blue Mobile L subscription includes four additional devices. Does it mean, that I get four additional SIM-cards for tablets and other devices already in this subscription without an extra option?...
Multi Device Options: Mobile Plans | Swisscom
>... Can I use the additional SIM cards in home router for getting internet?...
yes probably with 4G or 5G home routers
With a Mobile ABo Go and three MultiDevice cards. One for the mobile router, one for the iPad and one for the language translator. The mobile router, which has a LAN and a WLAN, is used where no wired Internet is available.
The mobile router should actually reach the same speed as the main device, i.e. new to 5G and good reception 1Gbit/s. With a 5G mobile router you can reach 270/120Mbit/s.
In principle, Swisscom also has a Fair Use Policy, i.e. the speed can be throttled if the data volume is excessive.
all information about blue Mobile L
blue Mobile L − mobile subscription details | Swisscom
if in doubt contact the Swisscom Hotline
Residential customers: contact us via call, chat, text | Swisscom