In a recent interview with the computer history museum, Tony fadell, the "father of the iPod", said - at first, they didn't plan to equip the iPhone with a SIM card slot, and jobs and them originally envisaged creating a more "seamless" device** Apple insider pointed out that this interview is mainly to promote Tony fadell's new book "build", which reveals many interesting stories related to apple.
（via Apple Insider）
In addition to revealing Apple Co founder and then CEO Steve Jobs wanted to cut the SIM slot from the early model, Tony Fa Dell also revealed that it mentioned its support for CDMA cellular mobile network technology.
Recalling the "pre 3G surfing era" (exposure age) that supports "writing numbers in the air", we are not unfamiliar with this feature of CDMA devices (such as the sprint version [iPhone] used by Xiaobian)( https://apple.pvxt.net/c/1251234/435400/7639?u=https%3A%2F%2Fwww.apple.com%2Fcn%2Fiphone%2F ) 4 + China Telecom 3G network).
Video screenshot (via computer history museum)
The former Apple engineer recalled that he had to rely on all available market data to advise jobs not to do so. The reason is that this CDMA based design will lead to very low equipment adoption rate.
After all, for a long time, CDMA standards are not as competitive as the mature GSM ecosystem.
CHM Live Building Great Things - Cpmputer History Museum（via）
Interestingly, with the popularity of ESIM technology, there are many rumors recently that the upcoming "iPhone 15" series smart machines are likely to "give up the physical SIM card slot again".
Earlier, Tony fadell also talked about jobs on iPod / some controversial decisions made during the iPhone development stage, such as the former CEO's initial refusal to provide PC version of iTunes software (even if the experience is quite unbearable).