Q: Speaker on 5s has stopped working

Hello joneag,

Thanks for using Apple Support Communities.

From your post I understand that your iPhone's receiver is experiencing issues.  To troubleshoot the iPhone receiver, I'd like you to please follow the steps in the link below.

If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support

Have a great weekend,

Alex H.