From Bitrino: WifiTrak for iPhone scans for all available WiFi devices and networks in the area and tests each network it finds for usability. It shows a list of the Wifi networks sorted from most useable to least useable. It can automatically notify and launch mail, a browser, or another application when it finds a suitable network. It features network list sorted from best to worst, automatic redirection detection, automatic scanner, adjustable scan time, ability to set minimum strength, and detail display with MAC address, channel, signal strength, noise, and authentication (WEP/WPA/WPA2).
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