Before make the payment, make sure your Sony phone has unlock attempts available.To check this, follow these instructions:
- With a sim card in your phone,
type *#*#7378423#*#* on call screen.
- press SERVICE INFO
- press SIMLOCK
In the first line of these screen, you will see “network” and a number on the right, if that number is greater than 0 means that you can unlock your phone.If that number is 0, you can not unlock your phone even if you have the correct code.