My wifi problem -- and solution

I realised this morning that my new iPhone has been using EDGE the whole time. You can easily see across the top if you are connected to wifi (it uses the airport-style signal strength symbol) or EDGE (symbolized by a square icon with an E in it).
I didn't realise that. Ah well... When I looked at our WiFi network and reviewed the details, I saw we weren't connecting at all. I have seen there are a few posts on the apple discussion forums about encryption problems--and we use WEP encryption. So, I told the iphone to forget the network, then reconnected and specified "WEP ascii or hex" instead of "WEP password" for the password.
Now, everything seems to be fine. EDGE is OK for when you're out and about, but at home (or work!) I'd want that wifi actually working.
MacBook Pro   Mac OS X (10.4.8)   2 GHz Intel Core Duo

I have an older Airport Extreme base station (g not n?). I have tried setting both a WEP or a WPA/WPA2 Personal password. However, even though all of these password settings work with 2 different MacBook Pros, I cannot connect to my iPhone with any password. The only way I can get wireless on the iPhone is to set the security on the base station to "none" and thus use no password. Thus, my only protection from the outside world is that I have a closed wireless network. I also tried using the WEP HEX/ASCII option on the phone (with a WEP password) but that does not work either. My passwords are just normal passwords with a mix of letters, digits and special characters (e.g. $), currently 13 characters all together. I don't understand what people are talking about when mentioning that passwords must be of a particular length and only have letters and digits and then entering the password starting with an extra $. Using Macs of various types with my Airport Extreme base, I have never done this. Any suggestions? This is important to me since it appears that I have no AT&T reception at my home even though the AT&T coverage tool (which I used before purchasing the iPhone) said I should get moderate coverage.

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