I would still be on VZW and probably a Droid or Tour. Not a fan of the Droid's design but I do like Android better than Blackberry OS so it would be either one of those.
Tough question because the iphone directly influenced Android and WebOS to be made. But hypothetically if they still came out without the iphone ever being released def Android.
Well the Droid is my primary device right now as I'm addicted to the customization and this thing running at 1.2GHz is amazing. But I say I would have to be using a BB if the iPhone didn't come out. Nothing else besides WinMo would exist.
I would definitely still be on Verizon. I had a storm and it was great but the web browser sucks. The only thing close would be the Droid and I have played with my co-workers Droid many times and like it. It would have to be the Droid!