Apple Bans Some Wi-Fi Stumblers From App Store

They are called stumblers or sniffers or finders. Apple has decided that some of these helpful Wi-Fi network detection tools no longer belong on its App Store. As Macworld points out, the group of Wi-Fi stumbler applications removed this week use private iPhone programming techniques (called APIs) that Apple has specifically prohibited in third-party apps. A stumbler performs a network scan for nearby wireless hotspots. Other Wi-Fi finders do not perform local scans but instead simply search online Web databases for hotspots registered by location. This latter class of Wi-Fi apps do not require any private iPhone specific functions and thus are not affected by Apple's ban.
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→ See also - Free Online Wi-Fi Hotspot Locators