This guide directs the user to remove the battery of the Nokia 3120b. The battery is easily accessible as it is located directly under the back cover plate of the phone. A new battery can be installed the same way an old one is removed.
Remove the back cover plate of the phone. To do this press down the lock as you slide the cover toward the bottom of the phone.
Once the back cover plate is removed, the battery should be exposed. Remove the battery by prying it out. This can be done with your finger-nail or a prying tool.