"When You Use the Frontier Android App. With your permission, we may access information from your device, such as your general location, contact lists, SMS messages, Call logs, photo and video library, documents, music. This information is only accessed if you grant us access to it, and if it's required for the service to operate, or required for specific features of the service to operate."
The app requests access to an unusually broad range of device data including contacts, SMS messages, call logs, photos, videos, and documents — far beyond what a typical ISP app needs for core functionality.