How many channels are present in GSM 900?

174 no ........ the uplink is 890-915 & down link is 935-960.....MHz each channel having band width of 200KHz & using by 8 subsciber.... so 25MHz/200Khz ......=125...so there are 125 channels present in GSM900 but one channel is use as a guard so only 124 channel present in GSM900