You need to know the encryption key. If your own wireless router's SSID is visible on the DSi, then it's a simple matter of entering the same encrpytion key as your computer uses to connect to it.
If you do not know any of the encryption keys, that's because those networks belong to and are paid for by other people. You aren't supposed to be able to access them without permission (it would be illegal to do so), either sort your own wireless router out, or if that's not possible, get a Nintendo wireless USB device which plugs into your computer and lets your DSi connect that way. Lastly, there are free public wi-fi spots in some places, like McDonalds restaurants, you are free to use those and they have no encryption.
you cant
why wont my yarvik connect to my wifi
you cant as their is not a cable or wireless devise made to connect the two consoles
There are tons of reasons. Most common are secured wireless is enabled, MAC table is enabled, your wireless adapter is not compatible with your wireless router, wireless router does not work properly and so on.
There are only some types of computer that will connect to certain types of wireless networks. Notebooks can connect to wireless networks like laptops do; just make sure your router is picking up signals and that its appearing on your notebook.
if you have the new xbox you can if u got the original 1 u cant
you can, or at least you should. maybe you need a new one? or a new modem
You cant connect to Xbox Live through your PC. You will need to connect straight into your modem, or either use a Microsoft Xbox 360 wireless adapter to connect through your wireless network.
Check settings for client connections, and check your firewall. Usually good servers have it.
You cant because the DS, DS Lite, and DSI all use wireless connections. i know because i have one
you'll probably just need to configure your router. make sure you've set WEP as protection for your wireless.
you cant, you have to go to a public wifi center like books a million or panera bread. there you get free wifi and can connect to the gts