If I understand correctly, the job of the data cable is to transfer current from a wall charger or computer to a phone. Through this current the phone decipers the zero and 1s to make it code/data. Now shouldn’t current flow at the same rate between two cables, provided the thickness/resistance is the same?
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It’s generally more about the protocol than the physical cable the determines the bandwidth. When you get to really high bandwidths you do need a better cable so the signals are cleaner and the differences between one bit and the next bit is clear.
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