IPhone won't maintain connection to my wi fi network, even though my mac and iPad do

My iPhone 4s simply will not connect to my home WiFi. I bought a new AirPort Extreme router and it still won't maintain or, really connect. I shows it's connected, but it won't open pages. Safari says it cannot open page because it has lost connection to server. Verizon even sent me a new iPhone because I can't connect. Please give me some ideas. I have tried so many things. I've been to the apple store twice, and my phone connects there, and also at my daughter's house, through their airport router!! HELP!!!

I've encountered the same problem after installing BT Home Hub 2.0 recently. My G4 airport had no difficulty whatsoever recognising and accessing wireless networks using BT's old (white) Home Hub, but my Mac system prefs appear to resist details of my BT Home Hub 2.0. It was all fine for a couple of days after installation but then the Mac started refusing to recognise the Hub ID and password. I feel sure it's something to do with the new Hub's security being upgraded from WEP to WPA. I've had a lengthy conversation with BT support who've taken me through every step they feel they can, including re-setting the Hub and manually entering the password in my Mac system prefs. But whatever I do, the hub will not now appear as an option in my desktop airport menu, even though it is designated as a preferred network in my system prefs. I have also tried the steps Black Muscle has taken without success. I'm connected successfully to the hub using built-in ethernet but of course that's not the wireless option I'm paying for.

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