"Scott M" wrote in message
...
John Stumbles wrote:

Trouble with the Maplin/Velleman idea is (a) unless the number of the
mobile
you use is completely unknown to anyone else it would be prone to
spurious
operation by other people phoning its number

Or its battery going flat - mine lights the screen & pops up a message
to let you know.

Or you get a spam text massage!

Sparks...