My apologies for the response being confusing.
The issue is that you are attempting to connect two devices that are both connected to cellular networks. Mobile network providers don't support devices connected to them acting as servers, which is essentially what the iCamSource is. (iCam is the client, which connects to the iCamSource, which is the server.)
The most common use case is for the iCam device being connected to either a WiFi or cellular network, and the iCamSource device being connected to a WiFi network. WiFi networks can be configured to allow devices connected to it to accept incoming connections, but cellular networks cannot.
The only solution to connect cellular to cellular is to connect via our Proxy service, but as previously stated, it has not yet been implemented for the Android version of iCam.