wifi does not connect to the network

Try going into general settings...look for networks....when it "sees" the router or network you are trying to connect to....click forget network first!This should clear any saved password for that network that is stored on the phone...Then rescan ...then enter the password...this should rectify the problem.If it doesn't then you

May have a faulty wifi module on the phone....but before you think that..try logging onto another network such as at a public coffee shop...that should confirm whether your phone is capable of connections or not.

if it doesn't try resetting the phone altogether....if you are still unable then it may been the wifi module.