I have an iPhone 4S and loaded the 3CX Phone for iPhone app that I want to use over my WiFi networks. The iPhone app was updated last week. It seems to work well at home where I connect to an old Dynalink RTA1025W ADSL Wireless Router. On the road I create my own wireless hot spot with a Netcomm 3G/4G Wireless N150 Router (3GM2WN) with a Sierra NextG USB Modem. Ultimately I'd like to use a mobile WiFi 4G device. On the road I can't hear the other party but they can hear me. Do you have any suggestions?