Get familiar with your phone
Mute the phone on incoming calls and alarms with tapping

When you get a call, you can mute the ringing sound by double tap on the display when the phone is closed. You can reject the same incoming call by double tapping again on the display. Sounds will be restored for the next incoming call.

Use Bluetooth safely

You can protect your device against unwanted content by hiding your phone from other Bluetooth devices, when you are not using Bluetooth connectivity. Select Bluetooth > Off or My phone's visibility > Hidden to do this. Also, do not pair with or accept connection requests from unknown devices.

Send an audio message

You can send audio messages with your phone. Sending audio messages is a multimedia message service. To send an audio message, select Menu > Messaging > Create message > Audio message and recorder opens. Now you can speak your message. Enter one or more phone numbers in the To: field, or select Add to retrieve a number of your choice. Select Send to send the message. If you want to open a received audiomessage, select Play. If more than one messages is received, select Show > Play. To listen to the message later, select Exit.

Digital rights management in your device

Nokia 6600 fold uses various types of digital rights management (DRM) software to access DRM-protected content. DRM-protected content comes with an associated activation key that defines your rights to the use the content. Losing the activation keys or the content may limit your ability to use the same content on your device again. You may also need to restore the activation keys in case the files on your device get corrupted.

It's important to back up both the activation keys and the content with the backup feature of Nokia PC Suite. Other transfer methods may not transfer the activation keys which need to be restored with the content for you to be able to continue the use of DRM-protected content, if the device's memory is formatted.

Read more on Nokia PC-suite site