How To Take Back Off Nokia Phone. If your Nokia flip cell phone does not have a release button go to the next step. Remove the SIM and SD cards.
Remove the SIM and SD cards. If its a HTC One or a Droid DNA you cannot remove the back and there is no SD card slot even though the Butterfly which the DNA is based on does have one. Find the seam where the battery cover meets the body of the phone.
Gently turn around your Nokia 51 as well.
Apply heat to the back with a hair drier. You will find several small screws at the back. First place your phone face down and back towards you. Pull the back off.
