XIP.IO

If you haven't heard of, or tried to use xip.io before, you'll know that device testing can be a pain! However, the team at Basecamp have setup xip.io which is a wildcard domain that you can use (for FREE!) to test a local site on multiple physical devices, as long as they are all on the same local network.

Simply add ServerAlias yourdomain.*.xip.io to the vhosts file, and you're ready to go! There is no other setup involved, you can just start using it!