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That person thought you are a licenced Amateur Radio Operator and wanted to know your "Callsign" in order to intergrate it in Tinytrack's firmware. That way every time you transmit your coordinates over the VHF/UHF amateur bands your callsign (station identification number) will be aired too according to the rules. This of course is not necessary since your are going to use it with a cell phone and not with a radio transmitter.
As for the sound quality and audio frequency spectrum of the GSM phone network being not sufficient for this application I have to say that this person propably didn't know and he just tried to find something "smart" to say to you. GSM is all digital and has crystal clear audio as long as you have the minimal signal strength or no audio at all (if the reception is not good in the area). On the other hand amateur radios that are used along Tinytrack usually have worst audio quality.
Bottom line it works. I works for me, for a few friends of mine that I built units for them and for many people that contacted me over e-mail asking "how to" questions .
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