I just bought a pair of unlocked phones (JIAYU SIII 4G LTE). I need to select a provider. My location is known to have rotten coverage (a very small spot covering my house for about 1000 feet around.

Is there any application for an Android phone that can be used to survey the signal strengths of all the carriers in the area. It would seem that this should be possible. I can then use this to pick a network. The supplier maps leave much to be desired for specific small areas (like where you live).