Microsoft Lumia 640 User Manual page 6

Note: Turn the device off and disconnect the charger and any other device before
removing any covers. Avoid touching electronic components while changing any covers.
Always store and use the device with any covers attached.
1. Switch your phone off.
2. On the corner of the phone, put the tip of your index finger in the seam between the screen
frame and the back cover. Press the middle of the back cover, bend the cover open, and
remove it.
Do not use any sharp tools, as they may damage the screen.
3. If the battery is in, lift it out.
4. Push the SIM card into the SIM slot with the metal contact area down.
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