CK, phone coverage is in and out at Conchi but it's good most of the way and there is a big building that looks like a flying saucer about a mile before you get there, I can only assume its full of antennas for mobile phone/data and TV.
Steve we have only went from Andicuri to Diamari, not the other way around, DW made the comment "if you go down you know your not getting up" but I knew we could get out at Diamari. This trip we couldnt get from Rancho Diamari to Boca Ketu, even though we've done it before, I chickened out I was laying back waiting to see someone else do it, then follow but it never happened.
Thanks, LeaveTheKidsWithMom! That's good to know! As I go to Aruba by myself ~ leaving my fur kids with my DH ~ it's great to have cell phone reception at the Arikok park, in case, I get stuck there. I would love to do some exploring there as well, possibly with a jeep. In the past, I had just rented a regular small car and "back then", the roads at Arikok park were not paved. So I stayed out of it. But it would definitely be on my wishlist.