Once a phone is connected on a call through a particular base station, it will normally maintain connection with that base station even if the phone moves into an area with a stronger signal from another base station. However, when the signal to the phone drops below -68dB, the phone will begin looking for another base station with a better signal to which it can handover (this is often referred to as "roaming"). If the other base station signal is -62dB or higher, the phone will handover to that base station if it has free capacity.