Welcome to the Forum.
Could you check, please, if your wifi connection is turned on?
> settings>Wifi> Wifi networking on.
Iam facing the same issue. I got lumia 510 last week and never got wifi working properly. Probably this is gonna be my last nokia phone.
i too have the same problem... bought the phone only 4 days ago.. it dosent connect to wifi properly.. gets disconnected every 2-3 mins and then reconnects... please fix the issue!
sarad21, if you gone through all tricks in this thread, then it is very likely you are facing an hardware issue. Even with industrial production such things can happen on individual, some phones. Please, bring your Nokia to an local but official Nokia Care Centre. They refurbish the Software/firmware and check your reported issue of the hardware.