I am using Iqoo Z9s Pro. I feel this device vibration is so much weak. My phone was on the bed when phone call came. My phone is only 2 inches away from me. But no vibration can be sensed when the phone is ringing or Vibration mode. But when I take the phone in my hand, I see that it is vibrating. It would be great if the brand gives an option to increase or decrease the vibration.Is anyone else having the same problem as me? Please let me know.