For many large buildings (such as malls, hospitals and government offices), large properties (such as hotels, retirement homes, dorms or apartments), or other venues (such as ballrooms and convention centers) cellular reception can sometimes be unreliable or unavailable. This can be due to building materials, surrounding landscape, distance from the cell tower, and other surrounding buildings. When people can’t use their mobile device, it’s very frustrating for everyone, including employees, visitors, and anyone that needs to use their mobile device on site.