Understand a home router has one uplink port and an internal downlink port (192.168.1.1) but the internal downlink port is attached to a multiple port high speed switch.  The uplink port will have a different network designation than the downlink switch ports.  If your comcast box is giving your  netgear box an uplink address of .1.2 then your netgear downlink switch ports must have a different address like in the 192.168.2.0 network.  If you then put your laptop into a netgear downlink port and the S3 into the netgear as well, they might be 192.168.2.2 and 192.168.2.3 while the invisible internal downlink port has 192.168.2.1.

I make my top router have the highest network and the lowest the 192.168.1.0 net.