My upgrade on my Droid 1 isn't until March of next year (I've had it for just under one year already). I recently bought a slightly used Thunderbolt, and I'll activate that on my line and "switch" my plan to 4G. I did that just to guarantee I secure 4G, at least until the end of my contract, and potentially keep unlimited 4G after an upgrade. Hopefully they're REALLY going to keep current customers on unlimited, even after an upgrade. If not, I'm definitely shopping around. Of course, it depends on the area I'm living in, since some carriers have better coverage than others in certain places. If they're NOT going to let me keep unlimited after an upgrade, and no other carrier is better, I'll just keep on without a contract and buy retail or slightly used when I want a new phone.