[Tilde88]

It is designed for GSM bands in case of emergencies to block out a certain range of network channels to control data flow for security personnel. But it has a side effect, this setting changes the millisecond polling of towers. This is good to have at a higher number (highest 9) for people with less signal because when the phone's signal is low it continuously polls the satellites (to make it simple: if you have bad signal, it will keep attempting to get a better signal by pushing the connection... Which depletes your battery) in an attempt to raise the signal.