The only compelling use case for this device appears to be for kiosk-esque setups. For the casual user, it seems unlikely to catch on. I'm certainly not going to carry that thing with me, pull it out, plug it it in, open the FloJack app and tap one of those stickers to call my mom. This would be WAY more compelling if the device would fit flush with the phone in some way such that it'd be reasonable to keep it attached any time the headphone jack wasn't in use. I could see it fitting around the backside of the phone, as there's some pretty good real estate that could be covered without interfering with any other function of the phone. Unfortunately, supporting the different shapes of the target devices could get tricky.