I did talk about savings in day rates being balanced out by longer time estimates; I don’t know how representative this is of other folks’ experience, and it’s worth noting that this is the only time where we’ve considered offshoring any of our dev work.

I think you’re right to note that there’s inherent risk in mobile projects: they’re targeting a variety of software and hardware problems, involving producing consumer-ready services, and are typically operating to aggressive timescales.