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Hello thank you already for your reply.
Yes the device has a public IP address over LTE. The device is also already running two other VPN tunnels without problems.
Thank you very much!
From the pictures, you provide the version of your RUT240 is a bit old. Maybe you can update it to the latest version. This might solve this problem. Here is a link so you can download the image. To upgrade, you can upload the image via System→Firmware.
However, I think the problem is how you are configuring the VPN on the phone. For OpenVPN, you can create an OpenVPN configuration file for the client and upload it inside the app. This will allow you to connect that way. Otherwise, the VPN protocols supported by Teltonika and IOS devices are PPTP or L2TP. You must create a tunnel for those protocols and configure it on your phone in the same way.