Although most parts of Etsy are already accessible with smartphones, the optimized pages are meant to load quickly and fit on your phone's screen properly. We've also made them easy to use with your fingers, just swipe away to switch between photos and scroll through more products that are in a shop.
Read more about it here in our FAQs: www.etsy.com/help/article/494
Right now, we are supporting iPhones, iPod touches, and Android phones (OS 2.2 Froyo and newer) as these devices comprise over 95% of our mobile traffic. People with Blackberry phones running OS 5.0 and above have had success using Etsy mobile. However, it is not optimal and we are not supporting these phones at this time, so we recommend people with those phones use their computers.
Look out for more announcements on mobile, as we continue to improve Etsy, and make even more pages optimal for use on your phone!
(if you comment below, please help us out and note which Phone, OS version and Carrier you have...a quick line at the end will do!)
(iPhone 4, iOS 4.3, Verizon)