Stupid stupid annoying phone

Exactly how many screws have to fall out of a phone before it stops working?

My stupidly annoying Sony Ericsson phone – sorry, “handset” – has already gone kaput once. It had to be sent it away just three months after I got it, so that the software could be updated. And my high scores could be erased.

So what now? Well the slidey action jammed a few weeks ago, leaving the phone stuck open for several hours. After a while this fault remedied itself thanks to the sudden evacuation of an important-looking screw. Today it jammed again, and exactly the same thing happened. It’s now missing two screws, but works fine. What did they do? How many more are there?