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This video shows the operation and testing of the GSM / GPRS SIM900 module. A Sim Card from Tigo Móvil (Colombia) is used, and a call is made to see its behavior.
Consult more information about the SIM900 module:
agileurbia.com/GmPx
Note: Because the SIM900 is a cellular module, it must be registered as any mobile device, with its IMEI number that it brings to the backup, this process is done in any technical office of the mobile telephone companies, if this process is not done , you run the risk of being blocked and therefore not working.
In Colombia you can check if your device is blocked in this link:
www.imeicolombia.com.co/
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