I don't know if maybe the one-time number capability is tied to hardware, or tied to network connectivity - or maybe you need only one of the two paths. In whic

I don't know if maybe the one-time number capability is tied to hardware, or tied to network connectivity - or maybe you need only one of the two paths. In which case, you might be able to do it with a 5/5c/5s with network connectivity and a Watch, but you can only Pay fully offline with a iPhone 6 or iPhone 6 / Watch.