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Are you bored with the standard dialing tone of your smartphone? While those numerical audio signals were necessary in the pre-cell phone era, nowadays the sound effects are no longer needed to simply dial a number successfully, but the sound effects persist even on modern smart phones. Are you the one who silence the audio sound effects when dialing phone numbers as it annoys you?
Well, with MIUI you might try some other way around. MIUI has an interesting feature called Piano Dialpad tones or Piano keys! Are you aware of the feature? With this feature, each time you press a number button on the phone keyboard, a new piano sound effect plays.