What must you do to ensure your iPhone is secure?

Setting a strong passcode is essential for securing your iPhone because it acts as the first line of defense against unauthorized access. A strong passcode, typically recommended to be at least six digits or even alphanumeric, helps protect the data stored on the device, ranging from personal information to financial details and sensitive communications.

When a device is locked with a strong passcode, it prevents anyone from easily accessing the content or features without your permission. Additionally, the operating system may also allow for certain security features, such as data encryption, which adds another layer of protection as it ensures that even if someone gains physical access to the device, they still cannot decrypt the data without the proper credentials.

In contrast, while keeping the device connected to the internet, enabling airplane mode, or using it solely on Wi-Fi may have implications for security and privacy, they are not primary measures for securing the device itself. These other options do not directly enhance the device's defense against unauthorized access, which is why setting a strong passcode is the most effective way to ensure the security of your iPhone.