There will always be a IP address. As long as your connected to, in some way, a network, you will have a Internet Protocol. The best you CAN do is disguise your ip.
Some free and good VPN's are:
ProXPN
Cyberghost VPN
I prefer Cyberghost as its really fast and doesn't effect your internet speed even as a free user.
With proXPN you will lag alot without premium as it's limited to 300k/b as a free user.