Preferably free

Run tailscale on your machine at home and configure it as an exit node. Install tailscale on you mobile device. No router or firewall configuration needed. Free as you requested.

Tailscale all the way. It is an amazing product. Allows you to form a Tailnet to share traffic across a group of devices.

As the reply above said, you'll install it on any Linux, macOS, or Windows machine and keep it on while out of the country. You could also use a Raspberry Pi.

You'll configure it as an exit node. Then you'll install Tailscale on the machine you're traveling with (phone, laptop, whatever). Whenever you attach to the exit node through your traveling machine your internet traffic will be routed through your home IP address.

Look up the docs on Tailscale's website and watch a few YouTube videos and you'll figure it out. It has a lot more uses, FYI. I use it for connecting to my home server for backing up photos remotely (personal cloud), streaming media, ebooks, and many other things.

There are also tailscale clients on ios and Android.
If you have a desire to self host netbird is an option also

fav13andac1)c said:

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I use it for connecting to my home server for backing up photos remotely (personal cloud), streaming media, ebooks, and many other things.

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i wish i knew how to do this, lol that's awesome