Q: 1 person only can't hear when I call

Hi Tnngal, 

I know that it can be frustrating when your daughter can't hear you on a phone call. Let's see if we can get it sorted out. 

While it only happens with just the one caller, take a look at the article below to go over some troubleshooting options. Make sure that you are up to date and that their is nothing blocking the microphone. If after checking everything off in the article and you are still experiencing issues, you will want to Contact Apple Support for further assistance. 

If your voice is too faint or sounds unclear using iPhone, or iPod touch
https://support.apple.com/en-us/HT203792

Have a good day