Thanks for your help. I have a Linksys WRT54G. Tried the DYnamic DNS website. Have a logon just need to look at the site some more to figure how to make it do what I want. I am wondering if maybe Port 80 is blocked by Comcast. the sketch has the IP and Port defined, with the Port in the sketch set at 80. When I try the IP of my Cable Moden with the Arduino disconnected...it sends me tro the LOGin page for my router. Plugging teh Arduino in lets me control from within my network. When I try from just 3G on iPhone I receive Server not responding error.