Fun Fact: Apple for some reason still lists the Teletype Adapter on their store, with photos of the iPhone 3GS
Fun Fact: Apple for some reason still lists the Teletype Adapter on their store, with photos of the iPhone 3GS
www.apple.com
Apple iPhone TTY Adapter
Apple iPhone TTY Adapter lets you use your iPhone with standard TTY devices, compatible with all iPhone models. Get fast, free shipping when you shop online.
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.