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I’m thinking if we should make use of the following components:

  1. Ardruino Uno
  2. SIM 900 GSM cellular shield for Arduino
  3. Relays
  4. Cell phone
  5. SIM card
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engineer
 · HyderabadIndia
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Y should we use a sim card again??

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SIM 900 is simply a modem. Using this modem, you will be able to send & Read SMS, connect to internet via GPRS through simple AT commands. So SIM 900 is nothing without a sim card

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