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The iPhone 3g would be the first modern “smartphone” from Apple; before that it didn’t allow adding more applications, same as the “dumb phones” before it. It just had a capacitive touchscreen and a better web browser
Even then, the batteries weren’t glued in and it was significantly easier to replace
Jobs was specifically against the App Store when the first gen came out
It was added as an update to the first gen after the 3g came out
https://appleinsider.com/articles/18/07/10/the-revolution-steve-jobs-resisted-apples-app-store-marks-10-years-of-third-party-innovation