HTC Desire 650 dual sim User Manual page 15

15 Unboxing and setup
When you have two cards inserted, only one card can connect to the 4G LTE/3G network. The
other card will connect to the 2G network only.
3. To replace the back cover, first align it onto the top part of the phone. Then align the edges
and press down on the back cover from top to bottom along the edges until the cover clicks
into place.