weak mobile signals

in my area i am getting signal from Jio Tower at 850 Mhz bandwidth varies from 3Mhz ,5 Mhz to 10 Mhz recently a new tower has been commissioned by jio which is around 2 km from my location but i am not getting signals of nearby tower even using Jio hotspot why i am able to get good signal...

Hey guys, I live in an apartment complex. I get very good signal outside my flat but inside there is zero signals. I did some research on net and came across some mobile signal boosters. but there are some blogs that say they are not legal. Does any one have any idea about this? Is there any...