Question: A mobile device user notices that the system update includes an update of the Primary Rate ISDN ( PRI ) . What is the function

A mobile device user notices that the system update includes an update of the Primary Rate ISDN (PRI). What is the function of the PRI?
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It is the data rate setting of the user account with the carrier service.
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It is the configuration of radio frequencies used on the device.
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It is the configuration of the data rates between the device and the cell tower.
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It is the configuration information that the device needs to communicate on networks other than the carrier network.

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