Why bsnl 4g signal goes off whenever power supply cutt off. When there is power supply , full signal with good inr remains continue. In my area ( up east rural) , i don't knw the exact location of bsnl 4g tower , may be i m getting signal from 4-5 km . But its gives good signal on band 28 even inside home. There is one nearest bsnl tower in my village but its only giving 3g services. I hope 4g services will be start on this tower soon.