This is Ask An Expert, where every weekday at 9:20am, KCBS Radio is giving you direct access to top experts in various fields.

Today: Apple is facing continuing legal battles over its App Store rules.

Tech giants from the likes of Spotify and Epic Games are challenging Apple’s hold on the mobile world, and the meteoric rise of artificial intelligence could displace the smartphone era altogether.

To break it all down, KCBS Radio news anchor Margie Shafer spoke with Tim Higgins, Business Columnist for the Wall Street Journal based in San Francisco, author of the recently released book - "iWar: Fortnite, Elon Musk, Spotify, WeChat and Laying Seige to Apple's Empire.'