Out of curiosity, several times I've called the WWV and USNO time
signal phone numbers via Nextel while simultaneously listening to WWV
time ticks on shortwave radio. In all cases the cell phone audio was
noticeably delayed, but only by a split second (less than 1/4 second).

Phone numbers:
http://www.bldrdoc.gov/timefreq/stations/sig.html
http://tycho.usno.navy.mil/phones.html

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Paul Hirose
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