02-04-2013 05:23 AM
Welcome to BlackBerry Support Forums
I assume you have BlackBerry Data Plan / BIS already on your account , if not then call you carrier to activate that it fix your current issues with BBM7.
If you already have that ( BIS ) on your account then you can try this to see if that help . First On your Homescreen go to Options > Device > Application Management > Delete BlackBerry Messenger from the list , then perform a Battery pull restart by removing the Battery while your device is Powered On .
Then Reset your BlackBerry ID password , For help refer to this Knowledge Base :
KB26361 :How to change or reset a BlackBerry ID password.
Once you have reset your BBID password login with your new BlackBerry ID password on your device.Finally from your device Browse to www.blackberry.com/bbm to download the recent version of BBM available for your device. After installing your device may reboot and associate with your BlackBerry ID.