With this method, you are actually making two separate calls; the first to your home or office landline, and the second from your home or office landline through the Internet to your final call destination. Users placing NetTalk calls must submit their user name and password in the admin page, much like with a Fixed Line Adapter.
Method 2 :
Another way to make NetTalk calls via your mobile phone is through VoIP technology. In order to take advantage of this service, your mobile phone must be WiFi compatible, and you must be in range of a wireless network. Simply submit your VoIP and WiFi user name and password and you can take advantage of NetTalk savings on your mobile phone.
(If used with home or office WiFi network, a user name and password is not required, however, if you access NetTalk via a WiFi Hotspot, you must provide a user name and a password in your mobile handset settings.