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I installed an application from Blackberry World and after that none of my application is opening. Also the mobile is not detecting sim. I tried to hard reset the mobile via Blackberry Link as well as via pressing the power + Volume up + Volume down button, but nothing is working.
Looking for an help.
None of those things restarts your phone? It's still stuck?
Last resort: remove battery. They say its not good to do but I have had to before. If you can't shut down first just pull the battery.
You have to hold down the buttons for about 10 seconds. IIRC, it doesn't work on the STL100-1, so try holding the power/lock button until it starts booting up again.
Or just do as Jaydee said and remove the battery.