More specifically, it was this set: https://emojipedia.org/apple/iphone-os-2.2
Interesting tidbit:
> Emoji support required iPhone OS 2.2 and a SoftBank SIM card.
To be honest, the images look like things I've seen a hundred times over in comic books and not much more original than GenAI.
These are very nostalgic. The way Apple's emoji look has subtly changed since then.