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Do I need to purchase a sim card for the GSMV4G Cellular Communicator? By Petra Paulson No.  A SIM card is already installed in the GSMV4G Cellular communicator . Therefore, buying another SIM card is unnecessary.  After you sign up for a monitoring service, y What is the difference between the GSMV4G and the GSMX4G? By Petra Paulson While both cellular communicators work with Vista Series Control Panels  (the  GSM4G  is recommended for the  Vista 21iP ), the  GSMV4G  is the more pop