iPhone XR ear speaker has gone too quiet
How could this happen. How to restore ear speaker volume?
iPhone XR, iOS 14
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If you mean on phone calls, try using vol up button during a call. It cannot be increased any other way.
Failing that, you should arrange a service or repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support