Yes - why?
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GREAT QUESTION. Does anyone out there have an answer for this?
Wired and wireless?
The wired telephone that Reagan was using used the public (or USMIL) telephone switching network to connect to NASA. Which NASA then beamed up using (as ToxicLiberyism explains below) a unidirectional antenna up to the Moon.
Wireless telephones on the other... don't have wires, so their only method of connection is if there is a tower nearby that they can connect to. If there is no tower in the direct vicinity, they have to keep dropping their connection generation (4G > 3G > 2G > GPRS > GSM) to deal with that. At some point the phone loses service because it has nothing to connect to. Mobile phone companies fix this by having towers at regular intervals so that when the coverage of one tower ends, another tower picks up.
Thanks.