Hi, DP members... I have got a doubt while viewing over my old mobile phone box... i have read in the manual they gvn as 900mhz, 1800mhz , 1900 mhz.. Actually i can understand they are frequency to communicate... but how it is possible to make more than one frequency point to get connected for many mobiles and then which frequency range sucks less power of my mobile battery and is there any change in speech clarity of the phone with respect to frequency change. Thank you.