I just tried several times each to all three of their published US lines. (My idea of fun in quarantine!) 305 371 2672 , 800 359 2672 , 888 494 2672 . All connected, eventually. But, I did have a noticeable fail rate, maybe up to 50%. Busy signals, "all circuits busy", "dialings" that drop before connecting. But all three lines at some point connected.