The European Union says it will outline steps to compel Apple to open up its iPhone and iPad operating systems to competing technologies under the bloc’s tough new digital rulebook, which threatens hefty fines for breaches.

The EU says Apple must make iOS more open to third-party accessories makers. The European Union wants Apple to continue complying with the Digital Markets Act. With the first proc

Apple Inc. has been warned by the European Union to open up its highly guarded iPhone and iPad operating systems to rival technologies, or eventually risk significant fines under its flagship digital antitrust rules.