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First Option: Phone in the Other Sim and check the Phone Network Signal If Network Signal Problem not Solved So Secend Option: Your Phone Network IC Fault So Please change Network IC And Network Signal Problem will Solved if it is there isn't much you can do on this side of the network. Contact your phone company.
The sony Ericsson ,default phone lock code is '0000'. If you have changed it, and you don't remember it now, then you need to send to sony Ericsson service centre to get it serviced.
There is no other way, it can be reset.