Cannot find wifi

Question

My brother and I got new Ipod touches for christmas - and they cannot detect the wifi in the house, despite the fact that all the laptops are running fine on it.
They have picked up the prescence of other networks, and resetting the wireless connections/ manually entering the information in 'other' hasn't worked.
We're using a Belkin N F5D8636uk-4 V1 router, on tesco broadband, set to broadcast ssid. I've tried about everything I can think of including updating firmware (there was no update avaliable) and restarting the router, switching off security, changing all the settings, nothing has helped and this is driving me to distraction - such a shiny new toy, and I can't use half the applications. ^^;;; Please, please help!

Answer 1

Okay - the problem now appears to have been resolved. After setting up the network to use my brother's laptop (vista) as the router, turning it off made the wifi return to being broadcast by the router - but with the settings he had set on his computer, with the new ssid and password, and now we can both pick it up.
...this may be the first instance of vista managing to fix a problem? XD;;;
Still, having gone through the settings, I have NO IDEA what has changed to make this possible! Everything looks the same - it's still set to b&g*n (There is no option for just a b&g network, btw. g only, n only, or all three. Changing between them earlier made no difference.).
The only difference apart from a new name and key seems to be that the SSID now has no space in it. Which seems a silly thing to have caused ANY issue, but at this point I have no other ideas. ^^;; If anyone has an idea what was up, I would be very obliged, in case it happens again!