You can get a Internet connection from the service provider and ask for the wi-fi router. With the wi-fi router, you can connect to the Internet through various other devices like Laptop, Nokia E51 etc., You will be provided with the password for the WLAN connection and only if you enter the password correctly you will be connected to the Internet through that WLAN. As you may expect, this password will be asked only when you connect to Internet through this WLAN for the very first time.
In Laptop/Computer, you have Network settings to identify and modify the settings if wrongly entered. But this is somewhat tricky in case of Nokia E51!
In Nokia E51, You have the option of Browse WLAN right at the home page for you. If you have customized for something different, use Menu -> connectivity -> WLAN Wizard.
This will give you presently available networks (if any) around you to connect.
If you did everything right in the first time, you are well placed. But there could be settings in some WLAN where the password will be changed every month. Here, you are forced to change the password even you entered the password right the first time.
You will not be allowed to access the network until you define the access point. So, automatically it will ask for the access point when you try to connect. In E51, you can enter the access point (other name for password) for the second time in two ways.
Go to Menu -> Connectivity -> conn. mgr. -> Available WLAN networks.
Find the network to define access point.
Click on Options -> Define access point
You are done.
Check now whether it works?
No. It doesn't! This seems to be a small bug in Nokia E51.
How to solve it?
Go to Menu -> Tools -> Settings -> Connection -> Access Points
You can find as many access points added for each network.
Say, If you are seeing for network A, there will be A,A(1),A(2) and so on.
Delete all of them.
Try to connect to the network as if you are connecting for the first time.
It will ask for the access point, give the access point and you're done!
WLAN is one of a very cool feature available in Nokia E51. Enjoy Browsing through your phone. The browsing experience with the speed of your DSL in mobile is great!