Check if your Blackberry unlocked

Go to: Options -> Advanced Options -> SIM CARD -> Then type: MEPD
Your phone will shows

Note: Each value should status “Disable”. If you see any “Active” value, probably this phone is locked by provider.

To unlock the phone, type: MEP alt + E
The phone will show up dialog screen for you to insert 13 digits unlock code. Once you insert correctly, phone will become unlocked permanently.
The 13 digits unlock code is vary from phone to phone; it’s depend on phone IMEI. To obtain the unlock code, you should contact your service provider.

See also:
BlackBerry Email Account Type
Blackberry Swiss Army Knife Tool (BBSAK)
How to sync BlackBerry contact to Outlook
How to upgrade BlackBerry OS
Enable vibrate while ringing in Blackberry with BeBuzz free
How To Backup Blackberry 3rd Party Application