[Thanks, Reece M.]
Update: We've had at least one buyer of a beta unit write in to tell us that his Streak is still functional, so it seems that the IMEIs haven't been blocked across the board -- so far, anyhow. Leave us your experiences in comments, won't you? Thanks, Josh G.!
Update 2: Dell just wrote in to give us some more background on the situation, and it looks like at least part of the confusion is stemming from the fact that the Streaks were provided with 30-day SIMs from AT&T; testers were provided with the following tidbit on the fate of their phones after the SIMs expired:
More importantly, it turns out that the agreement testers signed specifically forbade them from selling their Streaks, so it seems like it'd be entirely within Dell's right to report the IMEIs missing or stolen to AT&T -- not to say that ever occurred, but in light of the agreement, it wouldn't be out of the question."You can still use your Streak. Your beta phone number will be disconnected tomorrow, but you'll continue to have access to all the cool Streak features including the Android marketplace, games, email, Facebook, etc., you'll just need to connect via WIFI. Your Streak, while it may function on some carrier networks, is a beta phone and is therefore not certified on any carrier network, so it may not function normally. Any such use will be subject to and your carrier's data and voice plan."