No network, WiFi, 3G after iOS 7.0.6 Update (iPhone 4s)

Following my update to iOS 7.0.6 which completed with no apparent problems, my phone has lost all connectivity to my network, WiFi and 3G services.
'Carrier Settings' no longer appears in my Settings menu, and in 'About' I cannot view IC, or IMEI number - they appear to have disappeared. Furthermore, Network appears as "Not available".
Instead of 'Sim Fault', 'No Sim', or carrier information in the top left of the screen I have 'Searching' instead.
I have spoken to my network provider who cannot provide me an answer, and instead have pointed me in the direction of Apple.
I have attempted the following thus far with no result:
Soft reset - same result
Recovery mode reset - same result
Reset all settings and content - Not possible as cannot verify Apple ID password with no internet connectivity
Reset carrier settings - same result
Restore iPhone via iTunes - Not possible as cannot turn off Find My iPhone, cannot verify Apple ID to turn off function without internet connectivity
Attempted different sim in same phone - no change, 'Searching' still present in top left and no WiFi / 3G
Please if anyone can offer any support in this matter I would greatly appreciate it.

I just updated from iOS 7.0.4 to 7.0.6 and now my carrier signal is UNSTABLE. It will have a complete signal with 3G, and then after a few seconds the 3G signal will be lost and then the carrier symbol will be lost, and then the signal bar will decrease from 5 bars to no signal at all and then just repeat the cycle. I can receive messages but only when the signal is complete. I'm very frustrated coz i also use mg 3G connection as my internet through tethering but since the signal is unstable, i can't use it properly!

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