Switch wifi access point when the signal dips below a threshold (but before it vanishes altogether). I wrote this app after being frustrated that my phone would not connect to my secondary router even when its signal is much stronger than the primary router I was initially connected to at my office.
It is a small application that listens to system messages about signal strength and connects to better wifi access points based on the parameters you set. As long as you leave the application running in the background it will monitor your signal and reconnect as necessary.
from 319 reviews