From what I can tell it has been out of stock since roughly 2019, but the page is still up. I fell down this mini rabbit hole starting from this page.
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It is only compatible till the iPhone 6S, what am I supposed to use with my iPhone 12 🤪
The iPhone 7 and up, it became built into the phone without requiring a specific adapter. I don’t know enough about TTY to know if that means you plug it in with lightning, or if the lightning to 3.5mm adapter also includes TTY functionality. :(