There's no advantage from a security point of view, but much disadvantage because the VPN is end-to-end encrypted between your phone and the VPN server. This is

There's no advantage from a security point of view, but much disadvantage because the VPN is end-to-end encrypted between your phone and the VPN server. This is not; the mobile network has access to the plaintext traffic. The advantages of this that I see is better/easier management, you deal with a nice web interface/API and (if needed) competent customer support people rather than monkeys.