Hello there, cezz.
The following Knowledge Base article offers up some great information regarding activation help:
Get help activating your iPhone
http://support.apple.com/kb/ts3424
- If your carrier provided a SIM card, make sure it's in your iPhone.
- Restart the iPhone.
- Try to reach the activation server another way, then try to activate.
- Try connecting to a known-good Wi-Fi network if you can't activate using a cellular data connection.
- Try connecting to iTunes if you can't activate using Wi-Fi.
- Restore the iPhone.
- Check the system status for iOS Device Activation. If the iOS Device Activation status isn't green, try activating your iPhone later.
If you receive an alert message when you try to activate your iPhone, place the iPhone in recovery mode and perform a restore. If you still can't complete the setup assistant due to an activation error, contact Apple for assistance.
If you're asked to enter a password to proceed with activating the iPhone, Activation Lock might be enabled as part of Find my iPhone.
If your issue is with your device being disabled due to a forgotten password, then this article will be of use for you:
iOS: Forgot passcode or device disabled
http://support.apple.com/kb/ht1212
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.