Are there any simple 3G/4G add-ons for a Pi that will allow it to
power up into a mode where it has the ability to be connected to via
the mobile data connection?

I want a system that I can connect to from my home desktop/laptop on
demand.

Sort of 'thinking out loud' about this:-

    I suppose a USB 3G/4G dongle could provide the hardware required
    to make a mobile connection to the PI, recommendations?

    It has to 'connect on demand' dialling *to* the Pi, it can't keep
    the line open all the time, very expensive!

    So, is there software for Linux (and thus for the Pi) which will
    handle incoming calls to allow ssh login?

    How does one manage the other end?  Is there Linux desktop
    software to allow one to dial up a remote system and then squirt
    ssh down the connection?

Any/all ideas would be very welcome.

I'm happy with fairly low-level stuff, I am a retired software
engineer, grew up with Unix (solaris) command line and I'm also quite
into home-build electronics projects.


--
Chris Green
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