It is possible to hijack sessions only when WiFi is not using EAP, but it should work over any private networks (Open/WEP/WPA-PSK/WPA2-PSK)
It's kind of like Firesheep for android. Maybe a bit easier to use (and it works on WPA2!).
This application due to its nature is very phone-dependant so please let me know if it won't work for You
Use with stock browser (might not work with other)
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I do not take any responsibility for anything you do using this application. Use at your own risk