Select Menu > Settings > Connectivity > WLAN. Search for available wireless local area networks (WLAN)and select available WLANs and the desired WLAN.
Disconnect from a WLAN :Scroll to the WLAN, and select Disconn..
Modify internet connection settings:
Select Internet connection > Ask first or Do not ask. If you select Ask first, you are asked for the connection method every
time you open an application that requires an internet connection, such as
Browser or Mail. If you select Do not ask, the device connects to a saved WLAN, if available, when an application requires an internet connection.
Hidden WLANs do not broadcast their service set identifier (SSID). They aremarked as (Hidden network) in the list of available WLANs. You can only connectto a hidden network if you know its SSID.
Connect to a hidden network
1 Select (Hidden network).
2 Enter the SSID of the network, and select OK.
When you save the hidden network, it is displayed in the list of available WLANs.
How can I use always WLAN connection on my Nokia phone for Internet instead of cellular network (GPRS)?
Check Internet Settings
Create a new Personal configuration settings
Note : you are asked for the connection method every time you open an application that requires an Internet connection such as Browser or Mail.