Listing of available Wi-Fi networks.

Hi All,
Is it true that an iPhone device(iPhone 4S or 5) does not necesarily list/show available Wi-Fi network in a given location.
Is it that it first scans for available Wi-Fi netwoks and only when the Wi-Fi networks meets some minimum threshold like signal strength (and likewise other criteria) does it actually show up in the networks list.
It makes sense as there is no point in displaying an network which has very low signal strength (below the acceptable threshold value) where the changes of getting connected are very less.
If what I stated above is indeed how iOS handles Wi-Fi networks, can somebody share some technical docs links (from Apple and others) which confirms the above mentioned behavior.
I spent a lot of time searching for the same but could not find any, hence this thread.
thanks in advance for the help.

You need to ask that question in the developers forums:
http://developer.apple.com/

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