Comment by Melatonic

I've had the same issue as a more recent iOS convert.

I remembering looking into it and I think there's actually two forms of airdrop - one is local only (I think it negotiates over Bluetooth then does actual transfer over a direct WiFi connection). The other is a fallback or something and goes over cellular.

And for some reason it seems to always want to fall back to cellular when you have one bar of shit 3G in the middle of nowhere and are trying to send your friend 2 feet away a shitload of photos from your trip.