I recently got myself a USB Type C to Lighting Cable and a 30W USB Type C Adaptor(USB-PD). When I plug in the charger to my iPhone, I find my phone charging noticeably faster than normal but there doesn't seem to be any indication on the screen regarding the device being Fast Charged.

I read online about a "Double Ding" sounds when plugging in, but I don't think it seems to happen for my device.

I have a iPhone XS Max running latest version of iOS 12.

2 Answers 2


There’s no on-screen indication of the charging speed on current iOS versions.

The only way to really know is to time the charging, or use external hardware for USB-PD debugging that can show you the actual watts.

  • 1
    On Android this can simply be done with an app. So, I guess, in theory, if one had a jailbroken iOS device, one could make a program that displayed charging rate?
    – Fiksdal
    Commented Jan 12, 2019 at 19:22
  • 1
    @Revetahw Yep! That should be possible. Since you can read the information about the power delivery once Jailbroken.
    – Jash Jacob
    Commented Jan 13, 2019 at 1:30

You can hear a chime or your phone vibrate twice to indicate fast charging (these vibrations may be a few seconds apart, so be patient.)

  • 1
    Never noticed this happen. I have been fast charging for about 10 months now.
    – Jash Jacob
    Commented Oct 27, 2019 at 5:58

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