Quick Settings is the top drop-down panel on Android devices. The following will is a simplified guide for adding mobile data and mobile hotspot (and others: data saver) to quick settings on Samsung Galaxy Devices.

I can confirm this method still works with Android 7, 8, 9 and 10 with Samsung One UI 1.0 and One UI 2.0. This will work on both network-locked and unlock devices.

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