When using Control Centre from the lock screen you can activate Airplane mode - this prevent's Find My iPhone working if your device has been stolen.
However this device is still not usable to criminals due to iOS 7's Activation Lock:
With Activation Lock, your Apple ID and password will be required before anyone can:
- Turn off Find My iPhone on your device
- Erase your device
- Reactivate and use your device
To avoid this is turn off Control Center for the Lock Screen from the Settings app on the iOS device.
Apple have released iOS 7.0.2 to patch a security flaw where users could gain some access to the iPhone through the Control Centre.