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In 1981, United Video Satellite Group launched the first EPG service in North America, a cable channel known simply as The Electronic Program Guide.It allowed cable systems in the United States and Canada to provide on-screen listings to their subscribers 24 hours a day (displaying programming information up to 90 minutes in advance) on a dedicated cable channel.
In practice, however, delay is not an important factor for IPTV, since it is a service that does not require real-time transmission, as is the case with telephony or videoconferencing services. It is the delay of response to requests to change channel, display an EPG, etc. that most affects customers’ perceived quality of service.
After the acquisition of SageTV, LLC by Google, they began modifying and updating it to work with Google's upcoming Google Fiber TV service. SageTV v8 was the initial platform used for the Google Fiber Storage Box (DVR) and TV Box (Client). It has since been replaced with an in-house developed software.
The IPTV service is also available to all mobile device subscribers with the unifi playTV (officially known as playtv@unifi) app (formerly known as HyppTV Everywhere) for Android and iOS. Each unifi TV subscriber is entitled to two free mobile devices for watching, and customers are free to sign up for extra packages on an à-la-carte basis.