There is no need for the restaurants to have the app, they only need to supply the internet feed. Now the person that you are calling on the other hand, does have to have the app installed on their device if you wish to call them. I know this new technology is confusing to some, but it’s extremely easy to master. I tell people all the time to just use it, you can’t break it. As far as us, with our international plan we had Wifi all over the island with no problems. So I guess this issue about phones comes down to a cost vs convenience factor. Just me saying