Observer is a Symbian S60 5th edition widget which observes the calls and messages of your contacts in phonebook and displays them in a very unique way. In the Observer widget, you can select the contact you want to observe, the observing period (Current day, Current week, Current month and No Limits) and the observed events (Calls and Messages).
You can click on "Select Contact" button in the middle to load all the contacts of your phonebook and then select any contact. Once selected, it will be displayed in the main screen. Now clicking "Ok" button on the lower right of the screen will take you to the screen where you can see how many calls (Missed, send and received) and messages ( Sent and received) exchanged in between you and that contact.
The Observer widget works with Nokia touch screen symbian mobiles.