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If you want to use the broadest interpretation, then think on this:
School receptionist: Good morning, City High, can I help you?
Parent (using mobile): Hi, this is Mrs Smith. I was just checking my son is
Dosn't need to be a mobile, a regular cordless phone would do the trick.
in school. Can you check that for me?
School receptionist: Sorry, I can't reveal that information to you unless you can demonstrate you've paid your Frontline licence fee...
Of course, if any yuppie types in the 80 ever did that, that would be fine prior art.
Mobile and cordless phones have existed a lot longer than that. Just not as consumer items. Indeed quite a lot of daft patents involve technology which is decades, in a few cases literally prehistoric. -- Mark Evans St. Peter's CofE High School Phone: +44 1392 204764 X109 Fax: +44 1392 204763