Digital Republic offers you unlimited access to mobile Internet. You can access WhatsApp, Instagram, FaceTime, Skype, etc. and make calls with these social media apps without any problems. Classic incoming voice calls and SMS are also possible for free with your data SIM card in Switzerland.
However, normal outgoing voice calls and sending SMS can only be activated with a voice package. You can find more information here: Was ist Digital Republic Voice?
In the customer portal you can find the current phone number of the SIM card.