This is the solution for anyone have mep code 0 left in his handset that no attempt balance for enter code.
1.please install black berry desktop manager. (its free download from black berry website)
2.connect handset with pc.
3.open this software its shows booting rom and ask u phone unlock code(note: its not asking mep code just user code).if not phone code inserted then it update rom automatically.
4.now your handset reboot,
then you got mep code(10 left) in network lock section.
Now you can get correct and accurate unlock code for your Blackberry phone from any third party online vendors like UnBBLock.com here you need to specify your country, Network name to which it is locked, IMEI number of your phone. Then they deliver unlock code to you through mail with unlocking instructions. Using this you can unlock your phone from Network lock easily.