CDMA networks are special types of mobile networks that come from USA. They are created to work on USA market mostly with some exceptions to Europe and Asia.

The most important thing when you want to remove a network blockade is to check if your device asks for a network unlock code. When you insert a simcard from a network different than the original one for example your device comes from Sprint and you insert an AT&T simcard the device should ask for a code.

This is how it works with GSM models, and some models that support both CDMA and GSM. The problem starts when you device supports only CDMA. Such model don't ask for any codes and you cannot unlock them with any codes.

For example Sprint is a CDMA network which cannot be unlocked by code, because there is no way to enter a code.

Other option is an unlock device app. Two network T-Mobile USA and Metro Pcs use a different method of unlocking thanks to a special application.

The app should be pre-instaled on your device, or you can download from the official shop.

In such case the unlock is made through the app and doesn't use a code as well.

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