John Ternus used his first day as Apple's new CEO to preview a "phenomenal" iPhone launch and to thank predecessor Tim Cook.

New Apple chief John Ternus debuts amid foldable iPhone and AI race

John Ternus takes over as Apple's chief executive on Tuesday, inheriting a company that towers over the smartphone market but trails its rivals in artificial intelligence.

Apple will see Ternus take over from Tim Cook on Tuesday

Longtime Apple executive and engineer John Ternus is stepping up to lead the company as his predecessor assumes an advisory role.