How do I remove the back cover of my Nokia Lumia 820?

1. Make sure the phone is switched off. Disconnect the charger and any other device.2. Hold the phone in your hand with the front of the phone facing you. At the top right corner of the phone, put your thumbnail in the seam between the screen frame and the back cover. Push and bend the cover until a side seam opens slightly.3. Repeat on the top left corner, and remove the cover.