This only occurs for 'hidden' networks. If you do not have any hidden networks in your known network list than you will not be broadcasting SSIDs. This is yet another reason to avoid setting your AP to hidden.
Incorrect, this occurs for all networks! I've had some fun with Wifi Pineapples before.
http://nakedsecurity.sophos.com/2012/10/02/what-is-your-phon...