on the back of the iphone where the black plastic begins and the light gray ends....if you squeeze it together (on the side of the phone) it feels like it might move a little.....do you think this is where they might open th ephone up to replace a bad battery or something or is the phone i saw defective?

hopefully an at&t rep or someone who owns this phone can test this to see if all iphones are made this way????.......thanks in advance!!!!