How to enter code for SONY Xperia Acro HD IS12 SO-03D

How to enter code for SONY Xperia Acro HD IS12 SO-03D ?
Switch ON your SONY Xperia Acro HD IS12 SO-03D with a not Accepted SIM Card
Enter the Unlock Code we send to you
Your SONY Xperia Acro HD IS12 SO-03D is unlocked

If the phone doesn't ask for an unlock code:

Switch on your SONY Xperia Acro HD IS12 SO-03D with accepted SIM card,
Compose #987654321#
You will see a lock window
Ente the code we sent you and comfirm.

How to check the code counter in Sony phones:

Switch on your phone without SIM card,
Compose *#*#7378423#*#*
Select Service Info and then Simlock
If X is with Network and it is not 0 you can unlock your phone via code
If X is 0 your counter is locked and unlocking via code is not possible.