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A: In this case You should simply create the recipient specifying required GSM number and then while creating new Geofencing rule (or editing current rule) add as a recipient Your created recipient that uses GSM number

Time zone configuration

It is recommends to you use NITZ+NTP time synchronization, because firstly device will try to get time from NITZ (Mobile operator which you are connected) so you should have time  (GMT+1) depending where you are in the world and if the device will switch to NTP, there is (GMT+0).  

• You can configure your device NTP server which is local on your country to have a valid time and set time resync 1 hour. Device will update your device time every hour.