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Enter #0 # and press the Call button to access this menu.

If you enter a code and nothing happens, there are a few common reasons: how+to+use+secret+codes+on+samsung+galaxy+a7+2+work

This button can sometimes reset the battery gauge if it is miscalibrated, though it should be used sparingly as it can temporarily cause erratic percentage readings. 📱 Device Information Enter #0 # and press the Call button to access this menu