No its not apart of Joomla, but there is a iphone app that allows you to create your own iphone app that you can give to your users. It lets them shop from their iphone... It seem to work pretty good! But the price the guy is asking for is a App Killer! $550.00!!! If he was to lower his price below $100 bucks everyone using Virtuemart 1.1.9 would buy it!
And Virtuemart 2.0 is not stable! They are still trying to work out the bugs. They are at RC, and still don't have the importing J15 products setup working. Give them about a month and it should be ready or should I say safe! The last thing you want to happen after installing it, is to lose your database?