On occasion, Sony Ericsson P900 users have experienced problems with the phone locking up, preventing them from operating the phone or turning it off manually. Luckily, there are two easy-to-follow remedies.
Instructions
Soft Reset
1. To soft reset the P900--which will retain all of the settings the user has placed on the phone--first remove the battery.
2. Wait 10 to 15 seconds, then replace the battery in the phone.
3. Press the power button. If this soft reset doesn't solve the problem, the next step is to initiate a master reset.
Master Reset
4. Understand that a master (or hard) reset will delete all of the custom settings (including phone numbers, images and ringtones) saved in the phone's RAM and restore the device to factory defaults.
5. Make sure the flip cover is closed.
6. Place your thumb on the jog wheel (located on the upper left side of the phone). Scroll the wheel up, down, down, down--one click each. If you have done this correctly, the phone should start a hard reboot process. It will take around one minute for the phone to fully restart.
Tags: Ericsson P900, soft reset, Sony Ericsson, Sony Ericsson P900