iPhone + old Airport extreme no longer connecting

Hi Mac Mavens,

We have an (around 4 year old) Airport Extreme base station that has happily run a network (with WEP) with a MacBook, windows laptop, iPhones and an HP printer. The airport connects to a DSL modem to connect to the net. We recently moved house and now the iPhone doesn't want to talk to the airport network anymore!

All the other devices have connected happily, but the iPhone keeps saying "unable to connect to <Network Name>". In the airport utility the MAC of the iPhone doesn't even appear in the log (set to syslog level 7).

Any help greatly appreciated!

If u download "WifiTrak" for the iPhone does the Network show in that? From what i have read it would be a good idea to get rid of WEP and change your system to WPA personal, Seemingly WEP is not much protection.