Learn how to manage SIM messages on the Microsoft Lumia 640.
This device supports a Micro size SIM card.
- At the top corner of the phone, put your index fi nger 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.
Note: Do not use any sharp tools, as they may damage the phone.
- Remove the battery.
- Slide the SIM card into the SIM slot.
- Press the bottom edge of the back cover against the bottom edge of your phone, and snap the cover into place.