Can't Connect to any Wi-Fi Network

So today (9th Oct 2013) i connected to my works wifi perfectly fine, been using it all morning. then at luch time i left the building and turned mobile data on (and 3G). when i returned it didnt connect to the wifi. and is now displaying a "Unable To Join the network "[NETWORK SSID]" " on ANY network i try to connect to.
What can i do to fix this?
Phone: Iphone 5
iOS: 6.1.2
No i do not want to "upgrade" to iOS 7. i don't like it, and i will not be able to revert to 6 after.

Changing phone name and rebooting has fixed this issue.

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Can't Connect to any Wi-Fi Network

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