Picture this:

You've just landed in South Africa & all you have is
roaming, no local numbers & it's very expensive to use.
So you slip your Mobile in SA SIM Card into your Mobile.
You text your friends and loved one's for cheap,
call a cheap taxi company who's number IS IN
your phone and off you go.

On the way to your destination, you wonder what
the weather will be like for the next few days. So you
call up the weather report. Then you call up
Ultimate Holiday Planner and we begin searching for a
value for money tour for your needs & offer advice.
Finally, you decide to check your email with Google Mobile on
your phone, send a few emails and you arrive.

Or...
you come off the plane, get an expensive taxi, spend your time thinking about the next steps & what you need to do, arrive, unpack & slowly put the pieces together your own way.