Strange wi-fi behavior on 4th gen. iPhones

I have established a wi-fi network using a Comcast (Arris) gateway, which broadcasts on 2.4 GHz only. I've connected an Airport Express (latest generation) to the gateway via Ethernet, creating a wi-fi network that is identical in name and password to the gateway network (done according to an Apple instruction). Here's the thing. I'm able to connect all my iOS and OS devices to the network, except for my wife's iPhone 4S and my old iPhone 4. For whatever reason, I can connect her phone to wi-fi only when I'm in close proximity to the gateway router; I cannot connect elsewhere, even standing close to the AE, which is in an adjacent room.
When I examine the connected devices using Safari, I note that my wife's iPad (2nd gen.), which is located farthest from the gateway but on the other side of the AE, is connected via Ethernet (?). I presume that this iPad is using the AE's extended network rather than the gateway's.
Now, once I connect my wife's iPhone via the gateway router, it will not reconnect when it gets beyond a certain distance from the gateway and will not connect via the AE, as her iPad does. (Same problem with the old iPhone 4.) Yet, all the other devices have no problem connecting to the network either via the gateway or the AE.
So, there would appear to ba a hardware difference between the 4th and 5th generation iPhones that affects wi-fi connectivity, though I have no idea what that might be. Or, I'm simply doing something wrong.
Any ideas?

I may not be of much help because I just started using Macs for the first time on Wed,but I was having a similiar problem.Everything worked great for the first few hrs I was hooked to internet using and Aiport Express wireless router. I am at work right now on a PC and can't think of the setting on the Macbook that I changed.I know that I went into the section where you set up or change your your internet settings/network settings.There was a list where it showed Airport Express at the bottom of the list.Once I moved it to the top of the list everything was Gold.
When I get off of work I will come back and try and give better detailed instructions.
I have owned this Macbook for 2 days.In that short amount of time I can honestly say that I will never go back to a PC
Macs rock!!

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I got my eye on the new iPod Touch, especially because it is (from what I've read) an iPhone 4 without the phone and the GPS and a somewhat slightly inferior camera and display. I like the iPhone, too, of course, but the price is something that is really important to me, so it's iPod Touch for me.
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Strange wi-fi behavior on 4th gen. iPhones

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