The Optimus, also known as the GT540 Swift and the Loop GT540, is a mid-level Android smartphone designed and manufactured by LG Electronics.http://www.gsmarena.com/lg_gt540_optimus-3081.php GSM Arena - LG GT540 Optimus The GT540 Optimus ships with Android 1.6 Donut, but can be officially upgraded to Android 2.1 Eclair via an LG software release.http://mobilesmug.com/news/2-software/602-software-update-for-lg-optimus-gt540-android-21-eclair MobileSmug - Android 2.1 update for LG GT540 Android enthusiasts have created unofficial updates that allow the GT540 to run Android 2.2 Froyo, Android 2.3 Gingerbread and Android 4.0 Ice Cream Sandwich.
