wifi problem: it connects automatically to a neighbour's wifi

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http://androidforums.com – Hi there, my phone is Samsung Galxy sII and recently I've a problem: my wifi automatically connects with a wifi signal that I haven't password. So doesn't work!! I don't know why but in my room (and in other place) if the neighbour's signal is better than mine, when I turn on wifi it automatically connects to this (not mine) signal, the wifi indicator remains grey (without any white line of signal) but NOT switch to my wifi and internet don't work (cause I haven't my neighbour's password :) ) PS: my connection's password is memorized in my phone, in fact if I manually switch to my wifi intern (General)