No sound from text messages received

Check your iPhone settings

Go to Settings and turn on Airplane Mode, wait five seconds, then turn it off. Check Do Not Disturb. Go to Settings > Focus > Do Not Disturb and make sure it's turned off. Check for any blocked phone numbers.

If you can't make or receive calls on your iPhone - Apple Support

Can't send or receive message then try these steps first

1. Restart your device: ... 
2. Check your network connection. ... 
3. Check with your carrier to see if the type of message you're trying to send, like MMS or SMS, is supported.
4. If you're trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging.

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If you can't send or receive messages on your iPhone, iPad, or ...

The focus functions seem to be the main problem.

Many people set up without thinking about it a Focus schedule that starts at specific times or with Smart Activation. Someone also makes a Sleep Focus because they set up a Sleep/Wake alarm, instead of the normal alarm in the Clock app. But when a sleep focus is set up, other functions also follow, for example that notifications become silent.

As SravanKrA also suggests, check if any of your Focus profiles are active. Also check if they are set to start automatically, in that case delete or disable.

I have no issues with any of my devices. iPhone 12 Pro, iPhone 8, iPad Pro and iPhone SE (1st gen)

Have you checked whether your Silent Switch over Volume Buttons is activated? If it is red, it is Silent

Perfect!. Often a restart can do it, but people today forget that an iPhone also has the option of being switched off hehe. You're welcome.