this picture shows the two black plastic clips wich you want du unlock if you would like to reach deeper into the interiors of this phone.

the 2e pikture show how to place the slotted pan head screwdriver

to unlock them you have to turn the screwdriver around its own axe.

when you unlocked both, go with an ipod opening tool around the 3 other sides to unlock several other plastic clips, wich shold be easy to do