For LG Optimus S only, but may work on others. Widget allows you to set roam only, home only, or auto mode. No Root Required! Helpful when you have a weak signal, but the phone refuses to roam automatically. Works on Froyo (2.2) and Gingerbread (2.3).3G roaming varies by location and signal strength. On occasion, 3G may take a few seconds to activate while the phone searches for the best roaming tower.App provided as-is and without warranty. Check your carrier for roaming fees before using.