Can't serve up pages

I am sorry if I sound like an idiot, I'm still learning all of this stuff.

Ok I am running Ubuntu 11.10 with Apache2 I have a Zxytel Router and have setup port forwarding to point to my internal server address and I have set up the dmz with my devcice.

I have my domain pointing to my static IP address (external), and I don't know what I am doing wrong.

sites enabled default Virtual Host is set as *:80 as well as sites available

ports.conf is set the same way, *:80 and listen on 80

so I can't access the webserver at except through my mobile phone on a 4g network I can access the pages, but on my daughters phone I cannot, on a browser, in or out of the local network, it either just hangs and says "server did not respond" or says page is not available.

please help.

Oh and I forgot to mention, my isp does NOT block ports

http://your.ip.address works for me... Is it something different?