[catch23]

It's a bit different though -- if you look at stats on Flurry for some of the popular apps, you'll see that there is less than 3% iPhone OS 2.0 users out there. That's simply because iPhone users get a free OS upgrade when they hook up to iTunes. The majority of users who are still stuck in the 2.0 land are iPod Touch users since they actually have to pay for the 3.0 upgrade. That's why the iPhone market has significantly less fragmentation.

However, I have a HTC MyTouch android phone that is still stuck in 1.6 land. I upgraded from 1.5 recently, but it was not the simplest process to do so. HTC doesn't really make it easy for phone owners to upgrade their phone OS. It's possible for me to use the CyanogenMod to upgrade my OS to 2.0, but not without lots of effort at the command line.

The current slew of 1.5/1.6 android devices out there right now will probably never be upgraded to 2.x mostly because the phone manufacturers rarely make it an easy process.