@Expresso: Pogledaj si malo "Users manual" (Dobio si ga uz mobitel), tamo ti sve pise:
To get delivery status of a sent message
  1. From standby select Menu > Messaging > Settings > Text message > Delivery report.
  2. Select On. You will be notified when a message has been successfully delivered.
Users manual download (ovo ti se nalazi na 25. stranici)