You might need MAC address of your nokia device (e71 in my case) to connect to a wireless network that has mac security turned on.
To find your nokia e71’s mac address, goto your cell phone’s home screen and type this number code for mac address :
*#62209526#
This will display the MAC address for your nokia e71 which you can enter in the mac address’s list in your wireless router to let this device connect and use the internet connection.