There are two ways to setup nVpn on an iOS device, the most recent and as well the preferred method is using the IKEv2 so called "Profile" approach.

1. The easiest and most recent setup approach is using our pure IKEv2 protocol with the "Profile" method, the setup details can be found exactly here: https://support.nvpn.net/Knowledgebase/Article/View/408/51/how-to-use-our-ipsec-rsa-ikev2#ios_profile_approach

or

2. L2TP/IPsec IKEv1 https://support.nvpn.net/Knowledgebase/Article/View/401/51/how-to-use-our-l2tpipsec-ikev1