By downloading a free app you can turn your old iPhone or Android phone into a fully functioning metal detector. In a nutshell, the metal detector apps instruct your phone to detect the magnetic fields of metal objects.
To turn an old iPhone into a metal detector, just download the free app from this page and install it. If you have an Android phone, you can download the app for it right here.
If you’re the industrious type, you can mount your new “smart phone metal detector” on the end of a selfie stick so you can use it without bending over.
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