This article draws on a theoretical distinction between the concepts of "promise" and "myth" to explore the discourses on wireless technology bearing on each. Out of the wireless cult, we have retained two fundamental myths that are constantly and complexly intertwined in the promises of the wireless: the Greek myth of Theseus and the cosmogonic myth of Ether. Through the exploration of two historical chapters during which the wireless was celebrated (1870-1905 and 1973-2008), this article argues that the act of promising, understood as a potential mythical actualization, transforms the paradoxical nature of myths into a bet on the future.