Mobile guest service is a mobile app-based system that simplifies communication between guests and the hotel they are staying at. The app allows guests to address queries and issues without needing an employee to be physically present. Guests can use the app to interact with hotel services and facilities from their mobile devices. Popular hotel chains like IHG and Hilton both offer mobile apps that allow digital check-in/check-out, viewing bills in real time, using a digital room key, and making service requests. While the features are similar, IHG's app may have a slight advantage with additional digital services. Both brands could improve by ensuring Android users can also access the apps and digital services.