In certain rooms of my house, my HTC One m8 will automatically connect to someone's network extender in the area. The extender it picks up has a horrific signal, and also drops calls if I leave the certain rooms that pick up the signal. My Verizon signal is perfectly fine when not connected to this extender.
I have no idea which neighbor's it may be.
How do I prevent my phone from randomly connecting to this extender automatically?