Is it possible to set up a local VPN on Android?

Question

Android

Hello.
Is it possible to set up a VPN server on Android?
Plus, so that you can connect to this VPN server knowing the public IP address?

Let's say an android mobile device (Samsung S10) is now connected to the network and its public IP address is 123.123.12.1 (let's say the connection goes over the mobile network).
And then, from any other device, establish a connection with 123.123.12.1 (i.e. to the server, because the android device in this case acts as a server).
And so that then the traffic goes through the android device (Samsung S10).

Is this even real?
Kindly give me some advice.
Thank you all in advance =)

Answer 1

that's just one garbage, when you are online, the operator will shove this mobile phone into the "gray" network.

Answer 2

Termux , in theory, can help.

Answer 3

Yes, even applications are ready:
https://play.google.com/store/apps/details?id=com....
But you need root.

Answer 4

And who will give you a public address on the SIM card of your smartphone?
If they still give it, then you can, they even threw it out)

Answer 5

Realistically, of course, if you have a static white IP on your phone, which will most likely be a problem for physicists (they seem to give yuriks, I won’t lie about physicists - I don’t know)