FonoWin is a telephony app designed for iPhone devices, developed by WI-NET TELECOM S.A.C. This free utility falls under the Utilities & Tools category, offering telephony functionality for compatible iOS devices. It is compatible with iPad Pro, iPad Air, iPad Mini, and iPhone 5S (64 bits) or later with iOS 11.

Users can activate FonoWin on up to two devices simultaneously, but the telephony service can only be utilized on one device at a time. To ensure proper functionality, users need to have internet access and coverage on their devices. Additionally, FonoWin can take control of the Fija Win landline telephony service when installed.