Telephone Creek Falls in Zion National Park is located at the Temple of Sinawava viewpoint. Sometimes misnamed Temple of Sinawava Falls it is located on Telephone Creek. Be sure to visit it during the month of March when there’s snowmelt from the higher elevations. The rest of the year it may be dry or a trickle. The trail taking you to this view is a short five minute walk from the shuttle drop off point which runs part of the year. The paved trail takes you further north up the canyon of the North Fork Virgin River.
The World of Waterfalls has been to this waterfall, which you can read about here.