Because the version update displayed on your iPhone is no longer the latest version, the verification has been turned off by Apple.
iOS provides you with built-in security from the moment you turn on your device. iOS is designed with low-level hardware and firmware features to protect against malware and viruses, as well as high-level OS features that help ensure security when accessing personal information and corporate data.
To protect your privacy, apps that obtain location information from your calendar, contacts, reminders, and photos must first obtain your permission. You can set up a passcode lock to prevent unauthorized access to your device, and configure it to allow the device to delete all data after multiple failed passcode attempts.
The password also automatically encrypts and protects your stored messages and allows third-party apps to encrypt the data they store. iOS supports encrypted network communications, which apps can use to protect sensitive information in transit. If your device is lost or stolen, you can use Find My iPhone to locate it on a map and remotely wipe all data. Once your iPhone is lost, you can restore all data from the last backup.
Extended information:
Notification Center:
The Notification Center keeps you informed of new emails, missed calls, to-do items, and more. A new feature called "Today" can summarize today's dynamic information for you, which is very convenient. With a glance at your iPhone, you can tell if it's someone's birthday, if you need an umbrella, or if traffic will affect your commute, and you can even get reminders for tomorrow. You can access Notification Center from any screen, including the lock screen.
Just swipe down to quickly grasp all kinds of dynamic information. Today view gives you a comprehensive overview of what you need to know today, plus a sneak peek of tomorrow. With the new All and Unread Notifications views, you can see all of your alerts, or just those that haven't been processed in the past 24 hours.
Multitasking:
Multitasking is always a shortcut to switching between apps. Because iOS 7 learns when you like to use apps and updates your content before you launch the app. So if you regularly check your favorite social app at 9 a.m., relevant content you care about will be ready and ready for you to access at that time.
This is the multitasking feature of iOS 7. It has already thought of it for you before you do it. Double-tap the Home button to see a preview screen for an app you have open. To exit an app, just swipe up to move it out of preview mode. iOS schedules updates during low-power periods, such as when your device is turned on and connected to a wireless network, so it doesn't drain your battery unnecessarily.
Camera:
iOS 7’s camera puts all your shooting modes front and center, including photos, videos, panorama mode, and the new square mode. With one swipe, you can capture what you want, the way you want, instantly. And new filters allow you to better enjoy every photo. You can add a retro feel to your photos, increase contrast, or feel the charm of black and white, allowing you to express your artistic creativity.
Airdrop:
Sending photos or documents via text message or email is no problem. But if someone is right next to you, a text message or email can suddenly feel like a huge effort. Enter AirDrop for iOS, which makes it fast and easy to share photos, videos, contacts, and everything from any app with a share button.
Just tap ***Share and choose who you want to share it with. AirDrop uses Wi-Fi and Bluetooth to take care of the rest, requiring no setup and encrypting transfers to keep your shared content secure. With AirDrop, you can share photos or videos with one or more people you specify.
Just tap the Share button, choose who you want to share it with, and AirDrop will do the rest for you.
When running iOS 7, contacts in your address book running iOS 7 can automatically see you in AirDrop. But you can also make you visible to all nearby iOS 7 users, or hide you from anyone. Just one tap in Control Center and you're done. The recipient can choose to save everything you send. In this case, the content is saved to the appropriate location: the photo is in the Photos app, the pass is in Passbook, the contact information is in Address Book, and so on.
Reference material: IOS-Baidu Encyclopedia