How the EU's new 'gatekeeper' law will change apps we use every day

WhatsApp will allow messaging with other chat apps, and Apple will let iPhone owners download apps from rival app stores. Here's what's set to change under a major new EU law forcing big tech to play fair. — Photo: Zacharie Scheurer/dpa

BRUSSELS/SAN JOSE: A new era of fairer competition and greater choice for smartphone owners began in the European Union on March 7 when the bloc's Digital Markets Act (DMA) came into effect.

What is the idea behind the EU's new law?