iPhone: Supported protocols for VPN

This article covers the basics about the VPN protocols that iPhone supports. For making sure VPN is properly configured to work with iPhone, you should contact your network administrator or IT Department. You also might want to refer them to this article. iPhone supports the following configurations of PPTP and L2TP/IPSec protocols for VPN (Virtual private networks): PPTP + MSCHAPv2L2TP/IPSec