How the GSM system works?.
In various countries the frequency bandwidths specified for the GSM services are GSM-400, GSM-800, GSM-900, GSM-1800 and GSM-R.The GSM-900 and the GSM-1800 are the most widely used frequency bandwidths in different parts of the globe. The GSM-900 has a down link frequency range of 935-960 MHz and an up link frequency of range of 895-915 […]