To start with, (thank you JP for the photograph) it will be on sale as of July 17 in the FNAC and Darty in addition to the Orange shops.
It seems that the number of iPhones available at each sales outlet will be low. Typically an Orange shop can hope to receive only between 11 to 16 units, which in fact are already all pre-reserved (thank you Guillaume). A number of you are thus likely to find their nose in the water (as the French would say).
Note that it will not be possible to buy a naked apparatus at FNAC (thank you Raphael). They will only sell them together with an Orange subscription.
To finish, we are still unaware of the details of the procedure to pass from a iPhone V1 to a 3G. So far, Orange has given the broad outlines of this and its cost, however we are unaware of if it will be possible to make the update in shop, or if it will be necessary to wait and go through a convoluted procedure.
