Find "Text messages (SMS)"
Press All apps to access the main menu.
Press Messages.
Press the Menu key.
Press Settings.
Press Text messages (SMS).
Turn request for delivery reports on or off
Press Delivery reports to turn the function on or off.
If you turn on request for delivery reports, you'll be notified when your text message has been delivered.
When the box next to the menu item is ticked (V), the function is turned on.
If you turn on request for delivery reports, you'll be notified when your text message has been delivered.
Save the message centre number
Press Service center.
Key in +35387699989 and press OK.
Exit
Press the Home key to return to standby mode.