You can get the Unlock code from service provider.........
It may be due to network lock,
you can check it with other sim card ,if it remains the same problem ,it may be locked to particular network wont accept any sim card other than the particular network ,you can unlock it and used to other network,try here http://www.prounlocking.com/sony-ericsson-j105-naite/rs8wp9/
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