How to make sure your BlackBerry Pearl 8100 Doesn't delete all your calls, and messages.

Dear Friend,

1. Remove the battery and the SIM card from your SideKick .
2. Flip the sidekick open; press and hold the letter 'r' on the keypad.
3. While holding the letter 'r' on your SideKick , place the battery back in the device. DO NOT INSERT THE SIM CARD YET INTO YOUR SIDEKICK.
4. The sidekick will restart itself twice. Please make sure not to let the letter 'r' go until it has fully rebooted.
5. Once your cell phone has fully been rebooted, remove the battery, re-insert the SIM card and battery and power up the SideKick.
6. Once the device has fully rebooted, all prior information should be erased from the device and it should be restored back to the default factoy settings.

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HOW TO DO A MASTER RESET ON A SIDEKICK 3 1. Remove the battery and the SIM card from the device.
2. Flip the sidekick open; press and hold the letter 'r' on the keypad.
3. While holding the letter 'r', place the battery back in the device. DO NOT INSERT THE SIM CARD YET.
4. The sidekick will restart itself twice. Please make sure not to let the letter 'r' go until it has fully rebooted.
5. Once it has fully rebooted, remove the battery, re-insert the SIM card and battery and power up the device.
6.Once the device has fully rebooted, all prior information should beerased from the device and it should be restored back to the defaultfactoy settings.

HOW TO DO A MASTER RESET ON A SIDEKICK 3 NOTE: Performing this will restore your device back to factory defaults, meaning you'll loose everything on your sidekick!
1. Remove the battery and the SIM card from the device. 2. Flip the sidekick open; press and hold the letter 'r' on the keypad. 3. While holding the letter 'r', place the battery back in the device. DO NOT INSERT THE SIM CARD YET. 4. The sidekick will restart itself twice. Please make sure not to let the letter 'r' go until it has fully rebooted. 5. Once it has fully rebooted, remove the battery, re-insert the SIM card and battery and power up the device. 6. Once the device has fully rebooted, all prior information should be erased from the device and it should be restored back to the default factory settings.

Tried last 4 digits of cell # ?

Hope this helps.

you could go to the t-mobile store and ask them im sure they have it