The Sony Ericsson Xperia Arc is the thinnest Android phone we’ve seen to date. It's true to the Arc name as the back of the device is slightly convex. Aside from looking good, this also makes it easier to grab the phone when it's laying on its back on the desk. While it's decidedly svelte, it's not cutting edge on the specs side, though everything runs smoothly and we didn't notice any slow down with regular use.