It's not remotely the same. All iPhones made to date run the current OS, and are prompted to upgrade to it when users activate their phones or sync their music libraries or back up. Android's OS is upgraded by the carrier; most carriers aren't even a little bit interested in doing it; the few that are interested spend more time dithering than Google spends cooking up each new release.
Meanwhile, iPhone OS 4 will support all phones except the first generation (even if the second-gen phones won't support multitasking, they'll still run the third-party apps). No comparable statement can be made about any Android OS release, referring to handsets of any age, from any vendor.
Meanwhile, iPhone OS 4 will support all phones except the first generation (even if the second-gen phones won't support multitasking, they'll still run the third-party apps). No comparable statement can be made about any Android OS release, referring to handsets of any age, from any vendor.