Jon <spam@jonparker.plus.com> wrote:
> root@mauve.demon.co.uk declared for all the world to hear...
>> A mobile data-data call is much more reliable, when doing stuff like
>> VOIP
>
> Surely it's easier just to call the person?

Yes.
However, calling someone with a compatible phone, and being able to
automatically send complete contact details along during the call, share
pictures, bits of text, have your scheduling app talk to theirs about
times you can make, ... may be nice.
Not to mention encryption.