Learn how to insert the SIM card or unlock the Nokia Lumia 521. Find out more on this page:
Mobile Device Unlock
To insert or remove the SIM card, follow these steps:
To remove the SIM card, follow these steps:
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The Mobile Device Unlock code allows the device to use a SIM card from another wireless carrier. This may be necessary when traveling internationally. To enter the Mobile Device Unlock code, follow these steps:
Important: Stop if you receive an error message. The device may lock permanently if you enter the incorrect code multiple times.
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