If you've been holding off on buying AddOnIs, now is your chance to grab it at a great price. The app sells regularly for $9.95 but you can get it today only for just $5.97. AddOnIs packs a ton of great features into one application, so you have no excuse not to pick it up. Add firewall options, call vibrate, SMS signature, autolock and more. AddOnIs is available for all devices running OS 4.6 or highger.