Here in Belgium iPhones do not come with a contract, so from that point of view iPod Touches and iPhones are the same, and YET apple still charges iPod Touch users for updates over here and gives away those upgrades for free for iPhone users.
What is the difference in the price of the iPhone and Touch?
One way of collecting an upgrade "tax" is take it out every month. (lower up front costs). The other way is just to add 3-4 upgrade costs to the price of the device and mark that as deferred revenue. (get money upfront and do some slush fund thing so don't recognize it right away. ). There are $99 iPhones in Belgium?
These price might be outdated:
http://arstechnica.com/apple/news/2008/07/unlocked-iphones-in-belgium-make-locking-look-good.ars
$900+ for a phone? Apple might sell a couple 100,000 of those in the US. No way, no how they'd sell millions here at that price. (other phone contracts and mothly service bills remaining the same). [ and yes I'm sure the monthly phone service rates are cheaper and might have lower total lifecycle costs. Many folks in the US are hooked on the initial cost threshold. Sprint just announced a $99 netbook. You can get a bigger screen and surf sites with flash for the same price as last years iPhone. If it was $99 netbook vs. $800 iPhone Apple would get its but kicked. ]
There should be a gigantic gap between iPhone and iTouch prices there. ( Or Apple is hustling you folks will inflated Touch prices. )
Did some deeper looking later at the more boring number charts:
http://www.apple.com/pr/library/2009/07/21results.html
Go down toward the bottom to the "Unaudtited Schedule of Deferred Revenue". Apple has $6+ billion in deferred revenue this last quarter alone. Note how that has skyrocketed as the iPhones have sold off into a wider set of countries.
Yes, of course they could try the same thing with Touches. Jack up the initial price. Problem is that the touch has more competitors and Apple wants the unit volume.
P.S. So thousands of iPhone users upgrading to iPhone 3.0 allowed Apple to automatically wink-in deferred revenue into the actual revenue for the quarter. The money already collected just moved to a different column. So that is one reason for the magic non-holiday quarter spike in revenue. So no magical recession proof Apple there. The effect of the recession would be felt later and be evened out a bit since there is more of a delayed impact.