ios 3g

Hi, Can't get the camera to stream on IOS on iWMS5200 when on 3G network, works on any public wifi with iPad and iPhone, but not on 3G with iPhone. The camera is 2CD2142 with firmware version V5.3.6., using hiddns. Router is Netgear D6200, NAT and UPnP is enabled. I have opened all the ports...