Strange iPhone tricks: shows up automagically?

I don’t know what happened, but on or around last Wednesday afternoon my iPhone got sick and hiccuped up in the 1.1.1 firmware. Here’s what happened. I installed 1.1.1 last week had been using for a few days. I installed by hand, just copying it via SCP to the iPhone’s Applications folder. It didn’t show up, as was expected, and I resigned myself to my fate.

Suddenly, on Wednesday showed up. It just appeared. No warning, no resets, no nothing. In fact, I haven’t reset my phone — or shut it off — since I upgraded to 1.1.1 out of fear. It just happened. My GPRS also started failing on T-Mobile — looks like the Safari proxy is busted — but Wi-Fi works. I was then able to install third-party apps, all of them worked on 1.1.1, and I became strangely elated. What happened? Did Apple push an update? How did they push an update if I was on T-Mobile? WTF?