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I remember explicitly disabling acknowledging read reciepts on a sony ericsson in the mid-2000s because a friend of mine had discovered how to ask for them on their similar dumbphone and made dumb assumptions about how long until someone should reply.

No, it existed before the iPhone. It was actually weird to not have it on the iPhone, and I remember they were jailbreak tweaks to bring back the feature on the iPhone 3G.

TIL, guess I never had a phone that supported them. Do you know which platforms did?

the first mobile phone I ever owned (nokia 3310) supported it!

from the manual:

> Delivery reports

> You can request the network to send delivery reports on your text messages (network service).

I don't know exactly, sorry. My Windows Phone had it. BlackBerry also had the feature, but people used BBM at the time anyway.

> That's got to be pretty recent

Yes: only 20 years or so ;-)