In a letter to [url=http://blogs.zdnet.com/ip-telephony/?p=1761]ZDNet[/url], he had this to say: "Launching any product, especially one so hyped, means that the main task is ensuring sufficient supplies are available across the US market on launch. Undoubtedly there will be shortages, service issues and challenges for call centers set upto support users. Depending on reliability of the product, there may also be a rapid ramp up in returns and warranty claims. Using a global supply chain will likely cause more of a problem 4 – 8 weeks into the ‘first season’ of the launch. Pressure will also be felt for AT&T in terms of sales support – in particular trade ins, impact on the sales of other phones and customer’s expectations from a ‘revolutionary’ new product. The bottom line is that the launch of the iPhone is a high risk supply chain challenge."