The only way I solved a similar problem was by entering my netgear router wireless settings and disablng WEP security. I entered the settings using Internet Explorer
on computer and putting http// followed by router IP address (usually on bottom of router) and disable WEP (put router IP address into IE). The Iphone now logs on to wi-fi no problem.
You can also enter the iphones name and MAC address onto the authorised list and press APPLY. If Iphone MAC address is say 00:A5:1CD:A1 the name is NM00a51cda1 & press APPLY. The Iphone MAC address and details are obtained by going to SETTINGS-GENERAL- ABOUT. The iphone name is a derivative of the MAC address as above - hope this helps!
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