iOS 8.3 vs iOS 8.2: What’s New in iOS 8.3

Siri Speakerphone Calls

You can now place calls using Siri directly to speaker phone. This is handy if you are on the go or if you have Hey Siri turned on and are charging the iPhone at your desk.

Just say, "Siri call contact name on speaker."

Siri will verify the phone number if needed and then will call the contact and start the call on speaker phone. You can switch back to regular iPhone mode by tapping on the screen.