I have just found this very useful app called Pocket Hosts.
It is a very simple app which allows you to statically map names to IP addresses on Windows mobile devices just like creating a hosts file on a Windows PC.
This is really useful for testing especially when your test lab uses live Internet DNS names but is actually only an isolated system!
Here is a link to the download site, hope you find it useful.
One thing you should note…
….Make sure you do a soft reset after adding hosts otherwise they don’t seem to be picked up (at least on my test device anyway!)