"Hi...we just landed...the flight was good...tell Petey to pick me up....did you feed the dog?...are the kids in bed?...did it rain today?" These are the important calls that we will hear from the taxiway to the gate. I rue the day if cell phone technology (and the FAA) ever lets us make phone calls while in flight!
If the call is not important enough to use the Airfone...that call can wait until you are out of the plane.
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Regards,
Roo