tks. I haven't touch the router. I could use 3 G before, but after upgrade to beta version FW, it doesn't work any more. only wifi under same router is ok now.
i guess u can either try to reset your MTV or work on your router which i'd done before. in my case i ported forwarded all the ports & allowed my MTV to stream via 3g network. register your MTV internet ip address (tcp port 23456) in Port Forwarding column along with your DMZ if you have one. hope it works for you