access device at technical router

I need to configure a Teltonika RUT240 4G router which is using a prepaid sim cad. What are the steps to be able to connect with a pc from the world to a device (e.g. ssh, sftp, https etc.) connected to the router via mobile connection. Thanks.
GeologyETHAsked:
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JohnBusiness Consultant (Owner)Commented:
I have used these routers but not this particular model. You need to find the External IP you are getting from this device. It will likely present a double NAT and you may have to pay an upcharge for a VPN access point for the device. Then set up a VPN into it.

I have not connected without VPN on these devices.
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GeologyETHAuthor Commented:
Thanks. Up-to-now, the router has a test sim card and I'm connected with a pc via wireless connection to that router. The other device (which I need to access from the world) has now a static ip address from the router (dedicated by the MAC address). So far, the pc can reach the internet via the router.
The router shows a 10.x.y.z address for WAN. I guess that is what you mean by double NAT (The mobile is in a NAT and the device to reach, too). I pointed the pc to a web side showing the External IP, but I guess it cannot be used anyway since it will change periodically.
I'll try to setup a VPN connection. Do I have to take port forwarding or similar into account on the router?
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JohnBusiness Consultant (Owner)Commented:
If you get a VPN Account service from the ISP, you should not need port forwarding.
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GeologyETHAuthor Commented:
Yes, that worked. I tested it with the www.zerotier.com VPN.
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JohnBusiness Consultant (Owner)Commented:
Thank you and I was happy to help
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