Want to protect your data on your phone? You need a password. People can crack passwords, however, so if you want to be extra safe you need to wipe the data from your phone after they fail to enter your password correctly too many times. 10 times, in fact. Jump into Settings -> General -> Passcode Lock to find and option called Erase Data all the way at the bottom. If you enable it, your phone will wipe itself out if someone tries to access it and fails 10 times.
9. Siri Can Handle Your Calls
In addition to her (or now his, if you prefer) new voice, Siri can manage your call log for you. Need to listen to a voicemail? Just ask. Want to call back whoever just rang and you missed? Siri can handle that, too. Just make the request and she (or he) will take care of the rest.
8. You Can Change Your AirDrop Visibility
AirDrop makes it super easy to share files with other iOS 7 users in your vicinity, but perhaps you don't want everyone knowing you're ready and willing. If you want to place restrictions on who can send you files, you can just bring up Control Center and click on the AirDrop section towards the bottom left. You can decide if everyone, no one, or only contacts can see you. That way you'll only get file requests from the people you want—even if that's nobody.
7. Night Mode for Maps Avoids Blinding You While Driving Expand
Sometimes you don't want a bright white screen in your face, like when you're driving somewhere at night. Apple's Maps app automatically adjusts based on the time and provides you with a darker interface so you don't blind yourself while driving. You get this feature whether you like it or not, so there's no need to figure out how to turn it on.
6. The Compass App Includes a Spirit Level
Got a few crooked picture frames? The built-in Compass app now has a secret second page with a spirit level. Just line it up against the wall until you get a balanced zero degrees and then you'll know you're hanging things straight.
5. Messages Provides Time Stamps
Ever need to know when a specific message arrived? You can now find out by checking its timestamp in the Messages app. Just swipe on over from the right side of any conversation and you'll see when each message came in.
4. iPhones Automatically Join Trusted Free Wi-Fi Hotspots
iOS 7 makes joining free, trusted Wi-Fi hotspots much easier because you don't have to do anything at all. If you come in contact with AT&T Wi-Fi, for example, your iPhone will connect automatically and save you the hassle.
3. Mail Can Mark All Messages as Read
Remember how you used to have to exploit an iOS bug to mark all your emails as read? Now you don't! You can just tap the "Mark All" text at the bottom of your mail list and tell iOS 7 what you want.
2. You Can Make Audio-Only FaceTime Calls
You don't have to make a call with just your face. If you want to reach another iOS or OS X user without burning up your cellular minutes, or you just look like crap and don't want anyone to see you, then you can ring them via FaceTime. Just initiate the call the same way you would with video but click the phone icon instead.
1. You Can Block Calls and Messages
For quite some time you couldn't block calls through iOS, allowing annoying people to bother you unless you could get your carrier to handle the task. Harassment sucks in any form, and we're very happy to see Apple taking measures to stop it. If you want to block someone from sending you a call or message, you just need to hop into Settings -> Phone and/or Settings -> Messages and find the Blocked section toward the bottom. Tap it and add any people you don't want. You can always remove them if you change your mind.
Note from the author: I do not yet have an iPhone that can support iOS7. I have an ancient 3GS that will be rendered unusable if I download the new operating system, so I have to wait until I buy a new iPhone...which may be today! If you know of one for sale for a good price, please let me know. I'll buy it from you.