Do I need special USB-C cable for my 30w USB-C power adapter?
Do I need special usbc cable for my 30w usbc power adapter to use with my iPhone 12 mini?
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You can use the USB-C cable that came with your iPhone 12 Mini.
See the following from USB-C to Lightning Cable (1 m) - Apple
You can also use this cable with your Apple 18W, 20W, 29W, 30W, 61W, 87W or 96W USB‑C Power Adapter to charge your iOS device and even take advantage of the fast-charging feature on select iPhone and iPad models.