02-19-2013 11:47 PM
Welcome to the BlackBerry Support Community Forums.
Thanks for the question.
Did you install any new applications lately? Also were all the BBM contacts on there before? Try restarting the BlackBerry Z10 and then try to access BBM and re-invite the users.
I look forward to your reply.
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02-19-2013 11:55 PM
09-12-2013 06:32 PM
Never have to pull the battery. You have two options, press and hold the power on button for 10-15 seconds, this will hard reset your phone, or press and hold volume up and down buttons simultaneously and it will hard reset the phone.