SmartGuest is a mobile app created by HandHeld Hospitality that connects hotels with guests. It provides information on attractions, promotions, and push notifications. It allows guests to plan their day and hotels to increase revenue. While it has benefits like customization and sharing on social media, it also faces challenges like technology glitches and not covering all demographics. HandHeld Hospitality is working to expand SmartGuest through partnerships with companies like AT&T and Marriott International.