Hi,
Sorry to hear you are having issues.
First, I’d recommend updating to iOS 15.5 if you have not already.
This can be done within Settings > General > Software Update > Download & Install.
Update and confirm if the issue persists. If it does, you will absolutely need to reinstall iOS using a Mac or PC.
Note: If you are unable to update iOS due to device storage capacity being too full, or any other reason, dont try to update. Just proceed with the reinstall.
This is a software issue; and i admit I have never seen Voice Memos consume that much device storage capacity on a device that does not have the allotted storage size to store the content.
TO reinstall iOS, first backup your iPhone in Settings > Name > iCloud > iCloud backup > backup now.
Make sure to be connected to wifi and your iPhone plugged into the charger in order for the backup to complete in a timely manner.
Once the backup is complete, open iTunes on your PC, or Finder on your Mac.
Now you will need to turn off your device, and then place it in recovery mode as you are plugging into the computer.
If you have an iPhone that uses Face ID:
- press and quickly release the volume up button
- press and quickly release the volume down button
- press and hold the power button until ‘slide to power off’ appears > proceed to slide and power off.
Note: you can also follow If you forgot your iPhone passcode for further instructions.
Once the iPhone has been powered off, press and hold the side/power button and plug your iPhone into your Mac or PC. Keep holding the side button until you see a computer icon on your iPhone. This is known as recovery mode. You can now release the side button.
If you have an iPhone that uses Touch ID:
Note: This varies based on your iPhone model, reference If you forgot your iPhone passcode for further instructions.
- Press the appropriate button based on your iPhone model until you see the option to slide to power off > Slide to power off.
- once the iPhone has been powered off, press and hold the home or side button based on your iPhone model and plug your iPhone into your Mac or PC. Keep holding the button until you see a computer icon on your iPhone. This is known as recovery mode. You can now release the button.
You should then see a pop-up alert appear on your computer that says something along the lines of “there is a problem with this iPhone that requires it to be updated or restored.”
You will be presented with the following options:
Select Restore.
Next, you will see another pop-up alert prompting you to Restore & Update. Select Restore & Update.
From here, keep your iPhone plugged in until the restore and reinstall is complete. Your Mac/PC will now download the latest iOS from the server and then proceed to erase your iPhone, remove the currently installed iOS that is causing issues, and then install the latest iOS it just downloaded from the server.
It is normal for your iPhone to restart a few times, as well as see the Apple logo with a progress bar. Do not unplug your iPhone. Once your iPhone has completed the restore & reinstall, you will see another pop-up alert on your computer confirming that the process is complete, and advising you to keep your iPhone plugged in as it restarts.
Once your iPhone restarts, you should see it pop-up on iTunes/Finder, the ‘hello’ screen for the setup assistant should appear on your iPhone, and you may see ‘iPhone locked to owner’ if you have activation lock enabled on the device. You can enter your Apple ID and password on your computer, or on your iPhone to proceed with setting up the device.
From here, when you reach the ‘Apps & Data’ screen, you can select ‘Restore from iCloud backup’, and then restore from the latest backup, which should be the first one listed. This is the backup we did prior to erasing your iPhone.
Restoring from your iCloud backup can take some time, depending on your Wifi network connection and the amount of content being restored. In order for this process to complete as quickly as possible, make sure the following are met:
- reliable wifi connection
- iPhone plugged into power, whether it be the computer, or a working and reliable charger
- the screen locked
You can check the progress of restoring from your iCloud backup by opening Settings. At the top, underneath your Name, you will see information regarding the restore and how much data is left to restore before it is complete.
Once complete, confirm if the issue persists with your device storage in Settings > General > iPhone Storage.
Hope this helps.