Another thing that is forgotten about the first iPhone: I think Apple negotiated with AT&T (?) to change the voice mail system so you could select from your iPhone (voicemail app?) which message you wanted to listen. Prior, you always needed to call the mobile provider voice mail system, then listen the messages in order (or skip them). That was a huge early selling point for the iPhone. I know -- no one cares about voice mail in 2024, but it used to be very important.