Hi, If you have the MEP code for your Blackberry Curve, follow the steps given below.
1 - Switch on your Blackberry Curve 3G with any Sim card and Turn off all Wireless connections.
2 - Go to
Settings.
3 - Go to
Options.
4 - Select
Advanced Options.
5 - Select
SIM Card.
6 - Type
MEPD using your Blackberry Curve 3G keyboard (NOTE: You will not see any text appear on the screen while typing MEPD),
7 - Type
MEP then hold ‘ALT” key and type number 2.(NOTE: You will not see any text appear on the screen while typing MEP2),
8 - You will then be presented with a prompt "
Enter Network MEP Code". Type in the Unlock Code and press in the track wheel / jog dial to confirm,
9 - Your Blackberry Curve 3G will now be unlocked.
Source:
www.MobileUnlockGuide.com
If it still doesn't work, May be you are entering a wrong code. Get the exact code by specifying your IMEI number correctly.