When the batteries were live, my cellphone signal detector pen would light up at least once an hour when sitting near my cellphone. I always assumed that useful information was being exchanged with the nearest cell tower.
But Sunday (first morning after daylight time change in USA), I looked at my phone and it was still an hour off. It wasn't until I made a web connection by asking it to check my account balance that the clock finally reset to correct time.
So what the heck are all those little talks with the cell tower about if they don't even exchange the time of day while they are at it? (My definition of "useful" must be different than my cellphone's).
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