You can use any regular analog or DEC compatible handset with the HQTelecom's iPRIVACY Internet Phone adapter.   

We tested 2 handset phones that are fully compatible.  Please refer to our store to find  VTech Dec 6.0 Cordless, and Vtech CS6719-16 Speaker Phone

We are currently working on an APP for smartphones (IOS & Android devices), as alternative option to answer calls on your iPRIVACY number.  We expect to release our APP early next year (2016).