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If one would want to place a call using an Arduino which library would one use which was specifically designed for that purpose?

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If one would want to place a call using an Arduino which library would one use which was specifically designed for that purpose?

(a) The Firmata Library

(b) The TFT Library

(c) The GSM Library

(d) The Ethernet Library

I got this question in a job interview.

This key question is from Standard Libraries in section Arduino Programming of Arduino

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The correct option is (c) The GSM Library

The best I can explain: The GSM library on the Arduino helps the user to perform call, SMS, or even Internet Communications via the GSM Module. This library works in conjunction with the GSM Shield which uses a modem and AT commands to connect the Arduino to the GSM network.

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