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If your phone gets slow or doesn't work as it usually does, it may help to restore the factory default settings. All settings and configurations you've made on your phone are deleted.
1. Find "Restore factory set."
Press the Navigation key.
Select Restore factory set..
2. Restore factory default settings
Key in the phone lock code (default is 12345) and press the Navigation key. Wait a moment while the factory default settings are restored.