On Thursday, 22 September 2016 21:01:14 UTC+1, Bob Eager wrote:

It only uses the radio for checks - it's an atomic clock.

So is mine - it is linked by radio signals to the Cs/Rb atomic clocks on
the Navstar satellites. £1300 is very cheap technology.

Yours doesn't have an atomic clock in it.

Your mobile phone does not have a cable that connects it to Australia, but the phone mast does.