HTTP return code 413 is because the request packet is too large (see
HTTP/1.1: Status Code Definitions). If you do some searching around on google, you will see that this is a common problem with some phones and mobile browsers.
Are you sure that you are browsing mobile.voxalot.com with your phone (or are you somehow browsing
www.voxalot.com)?
If I could ask you to possibly try again, keep track of the urls that you go to and the exact time you did the test, and post back here and I will check the logs on my side to see if I can see anything.
--
Craig