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Installation was easy with use of Nokia PC Suite and I then opened the app by going to → Main Menu → Applications → Hidden Contacts which further directed me to its main screen that displays a list of all the contacts originally saved in your address book. Now you can select any contact and press the ‘Options’ tab that displays a list of all the available options.

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The first option is ‘Call’ and it allowed me to make any outgoing call to the selected contact from within the app. The second option is ‘Send SMS’ and it allowed me to send a normal text message to the selected contact or I could choose the ‘Direct’ option to send a direct text message without saving it in the ‘sent’ folder of my built-in messaging application.
The next option is ‘Set hidden’ and it allowed me to hide the selected contact from the in-built address book app of my Symbian device. These hidden contacts are only visible by entering a password which is by default 1234 and can be changed any time by going to the ‘Change Password’ option. Here, you can select the ‘Set Visible option if you no longer want to hide a contact and want to make it visible in your address book. The ‘Contacts’ option then allows you to add a new contact from within the app.
You can also select the ‘mark/unmark’ option if you want to select multiple contacts at one time and go to the ‘Show’ option if you want to display hidden or visible on all contacts in the list.

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Then I navigated to the ‘Settings menu’ where I selected the ‘Show contact name’ option to display contact’s last name first. I enabled the next two options to automatically clear the call log and text message log on my Smartphone.
Similarly, the next two options allowed me to lock the built-in messaging and installer applications so that no person other than me could have access to these. Then I selected the ‘Exit After’ option and defined a time period after which the application shuts automatically, which comes in handy to safeguard your confidential data if somehow you have forgotten to close the app manually.