Phone 3gs 3.1.3 J/B
problem, wifi at work all of sudden stoped working. Still see router and connects on the same ip adress. But dosent allow any data transfer. 3 friends at work with same 3gs and 3.1.3 have no issues at all. Tested while standing next to them less than 20ft from router.

I tried in the settings of phone to reset network setting and that didn't help. Still same ip address and no conection.

Wifi works great at home. Using it now to type this on iPhone.