Some people are reporting Slingplayer not to work correctly. Fact is, as long as you do not get the "Slingplayer only works on WiFi" error message, 3G Unrestrictor does it job correctly!
If slingplayer cannot connect it is most likely a network or configuration issue. This can be either your slingbox and lan configuration or your mobile internet providers blocking. There is nothing I can do about this and the app does trick slingplayer correctly.
Fortunately for most people it is just a configuration problem, so make sure: