An old iPhone is not always junk. With the right setup, it can become a backup phone, travel device, family tool, emergency camera, or simple home controller.
Use it as a backup phone
A working older iPhone can be valuable if your main device breaks, gets lost, or needs repair. Keep it updated as far as reasonably possible, charged occasionally, and ready with basic apps.
Before relying on it, confirm whether it can still connect to your carrier or Wi-Fi calling setup.
Use it for travel
An older phone can hold maps, translation apps, travel documents, music, and offline notes. It can reduce risk if you do not want to expose your main device in crowded areas.
Remove sensitive accounts if the device will be used casually or carried in higher-risk situations.
Use it for family or kids
With careful settings, an old iPhone can be a family communication device, music player, reading device, or supervised starter phone.
Set up screen time, app limits, privacy settings, and account controls before handing it over.
Use it around the home
Old iPhones can work as alarm clocks, recipe screens, music controllers, baby monitors with appropriate apps, or smart-home controllers.
Keep charging safety in mind. Do not leave damaged or swollen batteries plugged in.
Know when not to keep it
If the battery is swollen, the phone gets dangerously hot, or the device no longer receives needed app/security support for your use case, recycling or trade-in may be smarter.
A useful backup device is only useful if it is safe, charged, and not full of forgotten private data.