Calls
The Portable Hotspot only gives you an internet connection, it does not enable regular voice calls via your cellular network.
However, it does allow VoIP calls such as Whatsapp, Skype, Viber, Google Voice, Facetime, iChat, etc.
Texts
Portable Hotspot only gives you an internet connection, it does not enable regular SMS / MMS via your cellular network, however, it does allow messaging via WhatsApp, Skype, Viber etc.