Hello Pmckelvey,
Thank you for reaching out in Apple Support Communities. I understand you're unable to hear sound notifications for your text messages. I'll be happy to help.
I recommend making sure that your iPhone is not in Silent mode. You'll want to check that the Ring/Silent switch on the upper left side of your iPhone, does not have an orange color displayed. Here's a helpful article with a visual: How to put your iPhone on vibrate, ring, or silent mode
From there, I suggest to temporarily change the sound notification for the Messages app, restart your iPhone and set the sound notification of your choice. Then, test and see if you continue to experience the same behavior. Here's how to perform these steps:
- Settings > Notifications > Messages > Sounds > temporarily select a different alert tone.
- Restart your iPhone
- Then, go back to Settings > Notifications > Messages > Sounds > select your preferred alert tone.
Kind regards.