Call Volume too low on iphone 13 pro after ios 18.5 update

Are you referring to the volume of the caller you are speaking with? That volume is separate from other volume and can only be adjusted while you are actively in a call. Have you tried that?

"Call Volume too low on iphone 13 pro after ios 18.5 update: The Call volume is too low after updating to IOS 18.5 on my iPhone 13 Pro model. The volume works OK with Bluetooth and speaker mode"

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Low Volume After an Update:

Report this to Apple:

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of this, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread.
4. Proceed from there as necessary