The update is available immediately, and the Apple devices will alert users about it over the next week.

Apple streamlined functions in iOS 7.1 to make the experience faster for iPhone 4 users, which have a much less advanced chip than Apple’s newest phones and tablets.

With iOS 7, Siri recognized that a user was done talking because the person paused for a couple of seconds. Now, users can hold down the home button the entire time they’re talking to Siri. Once they lift their finger, Siri knows they’re done talking. Both ways of interacting are available in iOS 7.1. Apple also included new male and female voices for Mandarin Chinese, British English, Australian English, and Japanese.

iTunes Radio also got some tweaks. There’s a new search field that allows users to create stations based on their favorite songs or artists. Users can buy albums with a single tap from iTunes Radio, rather than only buying singles. And for the first time, users can now subscribe to iTunes Match from their mobile devices rather than from the desktop.

In the calendar month view, users can now toggle to see daily appointments. And the Touch ID fingerprint reader became more accurate with iOS 7.1. There should be fewer false rejections as well as quicker response times in reading fingerprints.

iOS 7.1 also includes a camera update that’s specific to iPhone 5S users. That’s because the newer phone uses Apple’s advanced A7 processor while older devices have less-powerful chips. HDR, or "high dynamic range," will automatically turn on when it’s needed. That takes many photos at once in different exposures to create a sharp image that looks closer to what the human eye sees, as the varying highlights and shadows are all accounted for.

Meanwhile, iOS 7.1 users will be able to take advantage of Car Play, which Apple unveiled last week at the Geneva Motor Show. The feature is a means for an iPhone (5 and newer) to power a touch screen on a new car’s dashboard.