As well as multiple servers 12vpn has multiple protocols (PPTP, L2TP, IPSec, IK2Ev2 and OpenVPN) so its pretty much unbeatable. I've managed to use it over 2 mobile networks, all the fixed ISPs and over multiple devices.
Actually Anycall is just the Samsung brand name for mobile phones in Asia. It has nothing to do with the radio technology inside or the network they have a partnership with. I've had Anycall branded phones that were GSM and WCDMA in the past.