In my case, an Apple iPhone 12 Pro Max could only partially replace the functionality and convenience of an Apple MacBook Pro laptop PC and a Windows desktop PC. But maybe it would work for you — In some ways, modern smartphones outperform the room-filling mainframe computers my dad, brother, and I programmed at various times between 1965 and 2015. Through electronic miniaturization, manufacturers pack processing power, high-fidelity audio, photography, video, navigation, location tracking, and more into these diminutive gems.