Hi there. Are you thinking for inbound (original bill upload) or outbound notification? We thought about it for the inbound but while we believe we can get the registration down to a simple 2-3 step process the bill itself is not enough so we would still need supporting information (force the use of the site anyway).
Regarding form factor our plan is a responsive site that down scales to touch devices. That will cover both desktop and mobile well.
Sure. But why scan? A phone pic is enough. That was the plan. How they send it in is the customers choice but in my view a simple web form is easier than asking them to write a bespoke email.
But by and large we would accept applications any way they would want to be send but I question the value of building MMS in the MVP. This would cater to the 'camera enabled non browser devices' and our research shows this is a tiny slice of our audience. However this is a quick thing to build so as we progress research on our target audience we may change our mind.
Regarding form factor our plan is a responsive site that down scales to touch devices. That will cover both desktop and mobile well.