Step 2. Tap on the Settings icon.
Step 3. Tap on Call settings.
Step 4. Tap on Fixed Dialing Numbers.
Step 5. Tap on Disable FDN.
Step 6. Tap on the Disable FDN text box.
Step 7. Enter your fixed dialing pin code and tap on Done.
Step 8. Tap on OK.
Step 9. Your fixed dialing will be disabled.
Before replying to a negative post, please have a read of this post by darrenpainter - it makes a lot of sense