Watch these great HTML5 graphic novels ;)
The first one has recently been published in a newspaper (low cost)
http://www.guardian.co.uk/world/interactive/2012/nov/06/america-elect-graphic-novel
The second novel is a splendid Disney production, with a stunning city landscape:
http://disneydigitalbooks.go.com/tron/
Text could be a problem on a phone, multilingual would be interesting imo.
The next level for comics or manga ? :)