Fere is there an additional daily charge of 2.50 CHF required?
Only if you want to use mobile data. Everyday your Phone uses Mobile Data, you will be charged 2.50 CHF.
You have to disable mobile data if you don’t want to pay the 2.50 each day.
Fere Also, with this package, can I use the internet for accessing social media networks?
Sure, with the mobile data enabled you can surf the internet like you’re in a Wifi network.