The company has begun using Pentalobe-screw heads on its devices. The screws apparently first started popping up on MacBook Pros in 2009, assuring that no one could get the pesky battery out of the thing. Next up, they began appearing on last year's MacBook Air, keeping the whole inside of the ultraportable off limits.
The screws were in place on a certain number of international iPhone 4 units, but not any of the ones that arrived in the first shipment of US handsets. Now, it seems, Apple has begun to install them on more recent phones