iOS
First, securely transfer the generated .mobileconfig file to your iOS device, 
then import it as an iOS profile. To transfer the file, you may use:

1.AirDrop, or
2.Upload to your device (any App folder) using File Sharing, then open the "Files" App on your iOS device, 
move the uploaded file to the "On My iPhone" folder. After that, 
tap the file and go to the "Settings" App to import, or

3.Host the file on a secure website of yours, then download and import it in Mobile Safari.

When finished, 
check to make sure "IKEv2 VPN" is listed under Settings -> General -> VPN & Device Management or Profile(s).

To connect to the VPN:

Go to Settings -> VPN. 
Select the VPN connection with Your VPN Server IP (or DNS name).
Slide the VPN switch ON.
(Optional feature) You can choose to enable VPN On Demand. 
This is an "always-on" feature that can automatically connect to the VPN while on Wi-Fi. To enable, 
tap the "i" icon on the right of the VPN connection, and enable Connect On Demand.

If you manually set up IKEv2 without using the helper script, click here for instructions.
Once successfully connected, you can verify that your traffic is being routed properly by looking up your IP address on Google. It should say "Your public IP address is Your VPN Server IP".

If you get an error when trying to connect, see Troubleshooting.

Remove the IKEv2 VPN connection.