IPhone stays on Edge even though secure wifi is present and connected

My phone connects to unsecure wifi fine. If I try and connect to a secure network, enter the correct ID, the phone says I'm connected and I get the wireless symbol for about a minuit before it switches back to Edge. Unsecure wifi networks no problem. The same thing happened on three different secure networks - connected and then switched to Edge? Has anyone else experienced this? Is this a software issue with iPhone or am I missing something? We have numerous computers connected via the secure wireless network working fine. Any advice would be appreciated. Thank you.
iPhone    

The Solution to the problem that you having is the following:
"Go to" SETTINGS
Wi-Fi
"Arrow over on the network which you are trying to connect"
Forget this Network
"Confirm" Forget Network
"Go back to" Wi-Fi Networks
"Choose the network which you are trying to connect"
*"In the Security box arrow over and choose" WEP hex or ASCII
"Now press" Enter Password
"Now enter your WEP Key etc..."
This should allow you to stay connected to a security protected network.

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