The phone is still on as i am able to make a call with Siri, i tried to tell siri to restart the iphone and she said she isn't able to perform that action now, i dont know what to do my iphone is unusable.Sounds like you have a depleted battery. Try plugging the phone into the charger. Give a few minutes and then powering the phone.
Yes i tried all the holding up and down and power button combinationsSo, you have tried all of these steps?
If your iPhone won't turn on or is frozen - Apple Support
If your iPhone has a frozen screen or becomes stuck, learn what to do.support.apple.com
If you have and they were not successful, this might be helpful:
the thing is this, im actually trying to remotely help my mother who is having this issue that im talking about over the phone. my understanding was that her iphone was stuck on a black screen but she's saying that thats not he case and that she can see the home screen but nothing on the display works no matter what she clicks, she is able to raise screen brightness to 100% im assuming from the control center but nothing else she clicks on the screen works so i don't know what to make of this, i tried to guide her to do the volume up and vol down and then holding power button multiple times and she says that isn't restarting the phone. she can't even make calls or send texts unless she tells siri to do so which is how she is able to communicate with me otherwise he 11 pro is completely unusable but for some reason she is able to change the display brightness.Have you tried asking Siri to set the display to 100% brightness?
If your mother presses the vol up and releases it quickly, vol down and release it quickly, then holds the power button for 1 second, she does not see the "slide to power off"?the thing is this, im actually trying to remotely help my mother who is having this issue that im talking about over the phone. my understanding was that her iphone was stuck on a black screen but she's saying that thats not he case and that she can see the home screen but nothing on the display works no matter what she clicks, she is able to raise screen brightness to 100% im assuming from the control center but nothing else she clicks on the screen works so i don't know what to make of this, i tried to guide her to do the volume up and vol down and then holding power button multiple times and she says that isn't restarting the phone. she can't even make calls or send texts unless she tells siri to do so which is how she is able to communicate with me otherwise he 11 pro is completely unusable but for some reason she is able to change the display brightness.
Should i just advice her to let the phone's battery die overnight by having the display on at full brightness and then plug it into power and that should probably solve it?
The slide to power off screen does NOT come up even after holding the power button for longer than 20 secondsIf your mother presses the vol up and releases it quickly, vol down and release it quickly, then holds the power button for 1 second, she does not see the "slide to power off"?
Since you are doing this remotely, what I would do, is have your mother take her phone into an Apple Store and see if they can help her. I sounds like it is be to triage this long remotely.
If your mother has a Mac computer, she could plug her phone into the USB port and try doing a Update through iTunes or Finder. This will refresh the OS and not touch her user data or apps. Make sure you tell her to only do the Update, not Update and Restore. Update and Restore will erase all the contents of the phone including all apps and user data.The slide to power off screen does NOT come up even after holding the power button for longer than 20 seconds