Formatting your phone may resolve issues.
Windows Mobile has the ability to reformat itself directly from its menu system. If you are giving your phone away or selling it, it is a good idea to format it first. Additionally, formatting is a quick way to free up storage if your phone is full on memory. Just be sure you back up your important files if you choose to do this.
Instructions
1. Choose "Start" and select "Settings."
2. Click "System" and Select "Clear Storage." Click the box for "Delete Internal Memory" so that a check mark appears in it. "Delete External Memory" will delete the contents of your SD card if applicable.
3. Press "Clear" to format your device.
Tags: your phone, Windows Mobile