Comment by varenc
12 hours ago
Bump didn't use direct device-to-device communication. A central server correlated the two bumping phones, based on geolocation and accelerometer data, then swapped the data via the server. At least that's how it worked in the early days. (Wiki page confirms)
Since it's relying on your internet connection, skeptical it'd be faster than AirDrop for a large amount of data like photos. But for swapping contacts I bet it was faster since it didn't have to spend time establishing a new direct connection.
That's true, I should have mentioned it did not use device-to-device communication. It was the best possible experience for the time though, BT was not viable and wifi direct did not exist. 3G averaged at maybe 10Mbps, and photos were 2 megapixels (if you had a camera at all), more than enough speed. We were mostly sharing URLs and contacts.
By faster I mean the initial connection, it was instant despite the server-based pairing, which made it feel even more magical. With AirDrop you sometimes experience quite a bit of signal hunting.
A comparable experience would be when you touch phones to share a contact with NFC, it was in that ballpark of responsiveness.