The most common reasons for failed downloads are insufficient space on the device, lack of memory, internet connectivity, and download settings. The Call.com app does not require more space than other popular apps, you can try freeing up some memory, closing some unused running apps, wiping up some of your old cache, or just making sure that your phone has a live internet connection and try again. If you have restricted data downloads on your phone, then you can download it next time you have WiFi coverage.
