[ormaaj]

It might have something to do with the high fidelity voice calling having a reasonably large bandwidth that you could theoretically use as a data channel - many times larger than an old v.92 modem. Maybe that's not so relevant these days with more people having unlimited data plans.

[eru]

Why would the phone manufacturer care?

(And in any case, as you suggest most people pay more per bit transmitted on a mobile voice call than they pay per bit as data.)

Purely for fun, it would be interesting to hack up two smart phones to transmit data over a voice call. Presumably, you can keep everything binary, if you control the end-points.

[kevin_thibedeau]

That's how SMS works. It's running a baseband modem over the voice channel.

[lxgr]

SMS is transmitted over digital signaling or transport channels. There was never any analog coding involved (except for a few retrofitted implementations on landlines in Europe).

[lxgr]

That would give you a 128 kbit/s channel under absolute ideal conditions (the maximum bandwidth supported by the EVS codec).

Practically, you‘d be better off using a throttled (after exceeding the included data volume) native data connection.

[ormaaj]

I see. Yeah pretty terrible.