Smarter Siri, better battery life as Apple launches iOS 9 update but smartwatch bug causes a delay

Apple’s iPhones and iPads began getting free software updates Wednesday, including battery improvements and a smarter virtual assistant.
The new features and capabilities in the update, iOS 9, are primarily refinements rather than anything transformative. But the new software is still worth getting, especially as new apps often require the latest version to work.
Apple Watch was also supposed to get a software update Wednesday, but that got delayed because Apple found a bug. A separate Mac update, known as El Capitan, is coming out this fall.
Here are some things to know about Wednesday’s updates:
ON THE IPHONE
Although some features such as 3D Touch contextual menus will require the new iPhones that are coming next week, existing devices will get: