This service has a tremendous potential to do good and help people in need.
As the previous poster mentioned, I too recommend you guys continue focusing on transparency and preventing scams. You don't want the service to be ruined because of a few bad apples.
IMO, a smartphone/android app would probably not be accessible for many of those living in developing countries. But the general trend I've been hearing about is that a growing number of people living in developing countries are getting access to basic cellular/text service.
Like I said above, transparency and accountability are our two strongest values, and we've spent a very long time making sure our operations are as legit as humanly possible.
Right now we are only working with three partners, all of whom we have a personal relationship with and trust 100%. That said, if/when we expand, we won't have the luxury of only working with people we know and that's going to make the due-diligence process more difficult. But unlike other NGO's (like global giving, kiva, etc.) we don't need a ton of partners to grow. A single partnership with an organization like Doctors Without Borders would ensure we have enough profiles for a lifetime.
However, I love the idea of having the community regulate the Medical Partner via SMS or something like that (sort of like an, "am I driving poorly? call 1-800... for healthcare providers). Great idea!