You are showing your age,I was tethereing a cell to a laptop as a modem at 14.4k Which was the same as a fax speed,Motorola did not believe it could be done until I showed them,self taught,you were proably still in diapers at that time
We used to take the little music maker things out of hallmark cards and use them to replicate the noise a dropped coin makes in a pay phone in order to place free long distance calls.
Your technology is boring now,outside of jammers,plug it in if it works fine if not throw it away and buy another,it was very expensive at that time so you had to learn how to build and fix it if you could not afford to buy it.
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