Nokia N97 mini mobile phone provides option for connecting to internet through WLAN. Some times the WLAN settings for Nokia N97 mini might be set to automatically search for WiFi network. This is not always required and also reduces the battery charge if it is going scan for available network for every 5 or 10 minutes. If you want to disable the automatic WLAN search feature then you can do the following.
Click on the phone menu button
click on the settings menu
then navigate to Connectivity
select WLAN link
Click on the Options menu
Select Settings from the list of available menu
Click on the Show WLAN availability option and select Never to turn off the automatic scan for Wireless network.