NetTALK DUO WI-FI VoIP Gateway - DUO WIFI-WB The netTALK DUO WiFi ® is a portable digital phone device that allows users to make crystal clear calls over high-speed Internet using any standard home phone with no contracts and no monthly bills. Enjoy free calling features such as call waiting, conference calling, Enhanced 911, 411 directory assistance, visual voicemail, and more.