Ask HN: Has Anyone Used Efani, “America's Most Secure Cellphone Service”?

Their homepage (https://www.efani.com) states that they protect "thousands of executives from top organizations", displaying logos from Y Combinator, Nasdaq, DoD, BoA, IBM, DoJ, et al. They offer "Secure Mobile Service against Sim Swap, Location Tracking & Eavesdropping...Backed by a $5M Insurance Coverage".