Hi, This task is very easy.
You can't use a VPN because the iPhone doesn't support that standard for security reasons. You can use L2TP or IPsec+L2TP.
regards
Nikola
What makes me feel the best is how I diligently practice discipline and learn to take responsibility even though in fact I have many shortcomings but I believe because this is part of the sacrifice of my efforts in the world of work