Launched amid much fanfare back in 2007, Apple's iconic Iphone changed the way we communicated, listened to music and searched the web.

But 18 years on how much can the company reinvent its signature product, which has had no less than 15 versions of its all in one handset.

And how can Apple navigate the dual challenges of AI and Donald Trump?

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Brian Merchant Technology Journalist and author of The One Device: The Secret History of the Iphone