My Xperia smartphone is operator locked. How can I unlock it?

You may experience that your device only works with a SIM card from a certain operator. This happens when your device is operator locked. 

How do I remove the operator lock on my Xperia device?

You will need a Network Unlock Code (NUC) also known as a Network Control Key (NCK). This is a unique code used to unblock devices restricted to a single carrier. After entering the code, you will be able to use your device in other carrier's networks. 

Where do I find the Network Unlock Code?

Your code is provided by the operator that sold you the Xperia device. Please contact them to receive your code.

How many times can I enter the NUC / NCK? 

You can try to enter the Network Unlock Code (NUC) for a limited number of times. Make sure not to exceed the allowed number, or you may need to hand the device in for service.

To check the number of attempts for Network Unlock Code (NUC)

To enter the Network Unlock Code (NUC) / Network Control Key (NCK)

I exceeded the maximum NUC / NCK attempts 

Depending on the country, you can take either of these actions:

1. Contact the network operator to get a replacement NUC/NCK code.
2. Send the device in for repair to reset the NUC/NCK counter.

To unlock your Sony Xperia device to all networks you must contact your Network Provider to get a NUC / NCK code. 

• The network lock on your handset is part of a contractual agreement between your Network Provider and Sony Xperia. Your Network Provider may charge an admin fee to obtain this code.
• Different phones have different unlock code input instructions. Once obtained and entered you will be able to enter SIM cards from any network into your handset.

NOTE: If you experience issues trying to unlock your device, please do not enter the code more than twice as this could block your device. This could cause additional charges due to having to send the device in for repair.

After I've unlocked my device 

Previous menu items, preinstalled operator settings for MMS and internet, and shortcuts to the operator’s online services may still appear on your device. Certain devices may not be able to delete these operator features.
It's recommended to only use operator locked devices with SIM cards from the specific operator it was designed to work with. An optimal performance of the device cannot be guaranteed, especially in relation to network-dependent features when an inappropriate SIM card is used.