I just did a few speculation calculations for some fun:
Consider each Apple store gets on AVERAGE 300 iPhone units and there are approximately 175 Apple stores. 300*175=52,500 units total for Apple stores
Say the 1,800 corporate ATT stores get 200 each on average. 200*1,800=360,000
52,500+360,000=412,500 total units.
I don't know whether these numbers are relevant but just for the sake of it, consider these numbers to be true. Personally I believe Apple wants to sell as many possible units on opening day which is why I estimated store averages so high. The total for all 1,800 ATT stores and approx. 175 Apple stores is 412,500 units available day one, probably an overestimate but given the strong demand and interest, is still quite a bit short of what will be needed. This could either be good or bad as Apple may be desperately under supplied or totally accurate with its first day sales projections. Predictions of 20 per store equal a total of only 39,500 units....why would Apple be prepared with only 39,500 units on the launch day of ots most anticipated product launch ever? Just something to think about...