Android natively supports the L2TP/IPSec protocol without having to install any 3rd party software. However the L2TP/IPSec protocol is not secure when using pre-shared keys so we only offer it for applications where security is not important e.g. if you are using the VPN to access geo-restricted content in another country. It may also be effective for defeating broad-scale non-targeted surveillance/data retention performed by many ISP's.
For customers who require some level of security we strongly recommend using the OpenVPN protocol. Please review the table and select the appropriate setup guide below. For a more in-depth comparison see L2TP/IPSec vs OpenVPN.