Description from Possio 

FRIDA looks and feels like a traditional fixed telephone. Everything else is different. FRIDA connects wirelessly over the GSM network why it can be used where no fixed lines are available or to save expensive fixed line subscription fees. Despite its look and feel FRIDA is a standard GSM phone. Like all other GSM phones you can bring FRIDA with you, change type of subscription and operator.

You can even send and receive SMS. FRIDA supports external antennas which helps if GSM coverage is poor. Mobile phones are personal and FRIDA also fulfills the need for shared phones. With a shared GSM phone people can still call a household, a location, a company, etc.