I live near the top of a hill and I have over a hundred 'other networks' visible, some unsecured. If I turn off my 4G wi-fi router (which I do from time to time, it goes slow for some unexplained reason, turning it off and on again gives me high-speed access again) it defaults to the strongest unsecured wi-fi. This is Not Good as I am stealing someone else's data allowance, which is a criminal offence. I have to manually select my network again after a reset.