Dim,
Some wireless N routers are dual band and some have the capability to run in the 2.4GHz mode. I use these Recommended Wireless Router Settings I use channel 11 in my Linksys WRT54GS
I tried different settings but not all the smart phones will connect and I also have a wireless printer I need to use.
If my router would eventually fail, I would want to switch to a dual band router.
Rick