Lending your phone for a minute is normal. A friend may want to see a photo, a coworker may need to scan a code, or a family member may need to make a call. These situations are usually harmless, but they can still expose private information by accident.
Start with chat and social apps. They often contain personal relationships, work conversations, notifications, files, and recent contacts. Locking those apps before lending your phone prevents the most direct privacy leaks.
Next, think about photos and files. Showing one image can easily turn into swiping through the camera roll. Sensitive screenshots, documents, and private media are better kept in a separate vault or behind a stronger boundary.
System settings matter too. Installation, deletion, account changes, time settings, and store-related actions can create small problems that take time to fix later. If a child or another person is using the phone, these entries should be harder to reach.
iPhone Locker turns this into a repeatable habit: choose the shared-use mode, lock the right app group, and hand over the phone with less tension.