We have only a few Ring Plus fans here so I will direct you to an article at Cnet about alternatives to Ring Plus, which is closing later this week (you'll need to port out by Feb. 11). The author shares several good ideas for low-cost replacements, very similar to what we report here. We agree on most of his ideas except his downplay of FreedomPop. How can you complain about FREE wireless? Yes, FreedomPop offers less Free Data than Ring Plus, which is why FreedomPop stands a better chance of surviving.
Ring Plus phones are based on the Sprint network, so other compatible companies we have positive experiences with are Ting, Tello, and Google Voice.