Been with IBVPN for almost 3 years now. Great service, good prices.
Awesome packages, been grooving with my P@P servers, can download and upload as much as I want. ATT has no clue on how many gigs a month I do not have to OWE them when torrenting considering all the data transfer happens on IBVPN servers. They have several US based servers with 100's of dynamic ip's and servers all over the world.
I suggest you check them out if interested in a VPN service.
They have also developed apps for android and ipads.
If your smart phone service only allows you so many gigs per month, bypass it with the IBVPN app, your carrier will not know the difference.