This section of the website contains posts about the mobile operating system Nokia
0x89740006
The above error message appears when you try to deploy a Windows Phone Project to a physical Windows Phone device.
Cause:
Lock Screen is active on phone
Solution:
Unlock the screen on your Windows Phone-based device
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This simple article explain how to install certificates file .cer on Nokia Symbian Phone.
Cause:
Mobile devices not accept all certificate formats.
Rename .cer file in .crt then copy it the across to your device and run installation tapping on the file into the device.
Did my HOW TO help you?