The outer casing must be removed to replace any internal component of the Blackberry 8820.
To remove the outer casing of the Blackberry 8820, you must have a 1/16 inch diameter torx screwdriver ready as well as a plastic removing tool.
Remove the battery cover by applying pressure and sliding down to the silver square on the back of the phone.
Remove the battery by prying under it with your finger or the plastic opening tool.
Remove the four small 3/8" long screws using a 1/16" diameter torx screwdriver.
Use a plastic opening tool (similar to the one shown) to carefully remove the two side bars of plastic.
Use the plastic opening tool to carefully pry the back casing off.
Pry off the front casing