For everyday use it is not necessary for you to open back cover or back cover from iPhone 4 / 4S device. But maybe one day you need to open the back cover for example because the cover is damaged fall or scratched then you intend to replace it.
Or maybe you want to give another look on your iPhone by replacing the back cover with other colors.
Or maybe you want to give another look on your iPhone by replacing the back cover with other colors.
How to open the back cover of iPhone 4 / 4S
First you have to prepare a special screwdriver that is a screwdriver pentalobe(screwdriver star), many sold, search only with the keyword screwdriver pentalobe 4s
There are 2 small bolts at the bottom of iPhone 4 / 4S.
Open into the two screws using a pentalobe screwdriver, rotate to the left (counterclockwise).
After the bolt is opened both of them, slide the cover to the left (according to picture below, iPhone in horizontal position, top left), then look open then lift out the cover.
To close / install the cover, just step above the steps behind it.