Today, Apple released an update to their mobile OS platform... iOS 7.1. Among a plethora of other improvements, this update improves performance on older devices, includes FaceTime enhancements, CarPlay integration, and much, much more.

Below is a full list of bug fixes and improvements:

CarPlay

iOS experience designed for the car
Simply connect your iPhone to a CarPlay enabled vehicle
Supports Phone, Music, Maps, Messages, and 3rd-party audio apps
Control with Siri and the car's touchscreen, knobs, and buttons

Siri

Manually control when Siri listens by holding down the home button while you speak and releasing it when you're done as an alternative to letting Siri automatically notice when you stop talking
New, more natural sounding male and female voices for Mandarin Chinese, UK English, Australian English, and Japanese

iTunes Radio

Search field above Featured Stations to easily create stations based on your favorite artist or song
Buy albums with the tap of a button from Now Playing
Subscribe to iTunes Match on your iPhone, iPad, or iPod touch to enjoy iTunes Radio ad-free

Calendar

Option to display events in month view
Country specific holidays automatically added for many countries

Accessibility

Bold font option now includes the keyboard, calculator, and many icon glyphs
Reduce Motion option now includes Weather, Messages, and multitasking UI animations
New options to display button shapes, darken app colors, and reduce white point
New Camera setting to automatically enable HDR for iPhone 5s
iCloud Keychain support in additional countries
FaceTime call notifications are automatically cleared when you answer a call on another device
Fixes a bug that could occasionally cause a home screen crash
Improves Touch ID fingerprint recognition
Improved performance for iPhone 4
Fixes display of Mail unread badge for numbers greater than 10,000
Continued user interface refinements

If you haven't already downloaded and installed the update, you can do so by going to Settings > Software Update on your iOS device.