The Japanese did:
https://www.nytimes.com/2009/07/20/technology/20cell.html
https://en.wikipedia.org/wiki/Mobile_phone_industry_in_Japan
Not that there weren't other companies playing with these ideas (IBM and Ericsson stand out):
https://www.webdesignerdepot.com/2009/05/the-evolution-of-cell-phone-design-between-1983-2009/
But Japan was leading adoption.
We assumed that the Palm Pilot and phone would merge at some point, but I'd visit Japan and wonder why the heck anyone would want to take a picture with a phone. But they were using their phones for everything-- email, SMS, pictures, games, subway payments, mini-web pages, TV, radio... I always assumed it was because they wanted to make use of the time spent on subways.
I suppose it depends on what you mean by "iPhone". Touch screens and cameras were around or nearly around 20 years ago, just crappier versions of them.
The tech has improved, and some surprises popped up, but for the most part we keep improving on old ideas until they become usable. I expect we'll see the same trend over the next 20 years. Ideas that seem underdeveloped today, will be streamlined and so deeply integrated into our way of life that it'll feel revolutionary even if the ideas themselves date back to the 80's:
https://en.wikipedia.org/wiki/Virtual_reality
or before:
https://en.wikipedia.org/wiki/Artificial_intelligence#History