هاتفي هزاز it means that my phone is always like shaking or vibrating , we call it in arabic صيغة مبالغة = an expression of exageration (هزاز ). However, اهتز هاتفي means my phone has shacked or vibrate,So it's not necessarily used to vibrate ;it can be the first time,it can indicate a message ,but when you say هزاز probably when the phone vibrate you don't pay attention because it's its habit. I hope that it is clear.
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