My blackberry 8100 will not cut on, it's showing a battery sign

reboot your handset, taking battery out of your phone

Hi,
There are two methods for unlocking Blackberry 8100 by MEP number and by IMEI#.
The simplest method for unlocking by IMEI#.
You can find your Blackberry 8100
IMEI number by follow one of these steps.

1.By Pressing *#06# into the phone.
2.On your Blackberry cell phone, go to Options-->Status.
3.put the battery out,there should be a white sticker it will show your Blackberry IMEI #.

This Blackberry Unlocking codes provider provides unlock code for Blackberry 8100
Hope this helps.

The battery is drain.

DO NOT use the USB cable to charge your Blackberry.

When the PC/Laptop/Mac go to power saving/SLEEP mode it will cut off the charge to the Blackberry.

Use the official AC charger to charge the Blackberry.

Make sure the AC power is not switch off to the power pack at night.

A hard reset involves physically removing the battery from the smartphone and then reinserting it. To perform a hard reset, complete the following steps:
1) Remove the battery cover from the back of the BlackBerry smartphone.
2) Remove the battery, and then reinsert it after a few seconds.
3) Replace the battery cover.

Take backup of the data and reinstall the software with the help of Blackberry Desktop Manager ........

phone might be cheap[ sorry for saying that] return it for another blackberry

clear sign of water damage under that button. 8100 is fairly easy to open with a T6 screw driver. then use alcohol to clean the area under that button. you need to also remove the while keypad membrane and clean under it as well

Thee battery is fully discharged. It may take an hour on the charger before this goes away.

No solution. This is a dead phone. Sorry.

Try removing the Sim card and re-inserting it.