"An iPad, even a Mini, is too big to carry around all the time as your primary phone." BINGO, that's EXACTLY the point of a foldable phone. I think you mistook what I wrote, I wasn't advocating for an iPad mini phone in its current iteration (although note we've had bluetooth headphones for what decades?), but rather for an iPad mini that folded down to a phone size with phone capabilities. Think about that for a second from a sales perspective. The iPad mini is, from most 2nd hand accounts at least, the least selling iPad out of their lineup. Add phone capabilities to it, let it fold to a phone size, and you have an instant seller. Yes it will still be niche, but much less niche than the iPad mini, and if done right personally I wouldn't be surprised to see it be the next big thing.