It's Network Unlock?
Because Network Locked so it Network Unlock!!!
You can specify the Network Current working and country,because that is Locked Network,if you Unlock it means you can any GSM Network Sim card in the Phone,if you not unlock means you can't use other Network Sim in the Phone,You can get the Unlock code from here
and Unlock it from Network LOCK,Follow the instructions below and unlock it step by step.
Samsung B5722 Unlocking InstructionsWarning :
Do not enter any wrong unlock codes on your Samsung B5722 mobile
phones. If you enter over a certain amount of wrong unlock codes on your
Samsung B5722 mobile phone, your phone may get hard locked and
sometimes become unusable.
1 - Switch ON your Samsung B5722 with a NOT ACCEPTED
2 - Compose : #7465625*638*CODE#
: We mean, to use a sim card from a network other than the network your Samsung B5722 is locked to.
: Its the unique Unlock Code for your Samsung B5722.