Install iOS 11.3 for Better Security

The iOS 11.3 update comes with enhanced security that will help protect you and your device(s) from harm. The update includes 27 known patches for potential exploits.

iOS 11.3 also includes a new privacy feature. When an Apple feature wants to use your personal information, an icon now appears with a link to access detailed information about how your data will be used and protected.

If you’re running iOS 11.2.5 or older, you’re exposed to an issue that lets people send a specific character that will crash an iOS-powered device and block access to the Messages app. It can also block apps like Facebook Messenger, Gmail, Outlook, and WhatsApp.
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https://www.gottabemobile.com/5-reasons-we-need-an-ios-11-3-1-update/