During the initial launch of the iPod touch, reviews have noted some differences when compared to Apple's similar iPhone. One of the primary criticisms of the iPod touch is the absence of iPhone's email, mapping and stock tracking applications. On January 15, 2008, Steve Jobs announced at his Macworld 2008 keynote that the "January Software Upgrade" for the iPod touch consists of five new applications: Mail, Maps, Stocks, Notes and Weather. The new Maps feature is similar to that of the iPhone's, with new software from Skyhook Wireless that pinpoints the user's location using Wi-Fi. The software upgrade is available for current iPod touch owners via iTunes download for US$19.99. New iPod touch units with 1.1.3 installed (MA623LL/B or MA627LL/B) will also have the software upgrade pre-installed. Customers who purchase an iPod touch with part number MA623LL/A or MA627LL/A must pay the upgrade fee to receive the new applications.