How to Unlock the Sony Xperia

1. Insert a foreig sim card (the sim card which is not supported by your phone)
2. The phone should ask for an unlock code
3. Insert NCK code in order to unlock the main network like T-Mobile, Orange etc. 
Insert SPCK code if the phone is locked in a subnetwork like Tesco.
4. The phone is now unlocked

Before order you have to check your counter:

How to check blocked counters:

Turn on the phone without sim card
Lock screen
Press sequence: Menu, Back, Back, Menu, Back, Menu, Menu, Back
Select Service info
Select SimLock
Check wher is X
If X is on NETWORK and value is difrent than zero, you can unlock phone.
If it is zero unlock by code is NOT available. The counter is blocked. You can NOT unlock your phone

OR

Turn on the phone without sim card
Type *#*#7378423#*#*
Select Service info
Select SimLock
Check wher is X
If X is on NETWORK and value is difrent than 0, you can unlock phone.
If it is 0 unlock by code is NOT possible. The counter is blocked.

OR

In new models #987654321#