IPhone 8 not receiving texts

Welcome to the Apple Support Communities!

I understand you are not receiving text messages on your iPhone 8. Is this a recent occurrence? If so, what has changed? The resource below will help troubleshoot this issue:
If you can‘t send or receive messages on your iPhone, iPad, or iPod touch

Try these steps first

1. Restart your iPhone, iPad, or iPod touch.
2. Check your network connection. To send a message as iMessage or MMS, you need a cellular data or Wi-Fi connection. To send an SMS message, you need to have a cellular network connection. If you turn on Wi-Fi Calling, you can send SMS messages over Wi-Fi.
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. If you don't see an option to turn on MMS Messaging or Group Messaging on your iPhone, then your carrier might not support this feature.
5. Make sure that you entered the correct phone number or email address for the contact.

If you receive messages on one device but not the other

If you have an iPhone and another iOS device, like an iPad, your iMessage settings might be set to receive and start messages from your Apple ID instead of your phone number. To see if your phone number is set to send and receive messages, go to Settings > Messages, and tap Send & Receive.

If you don't see your phone number, you can link your iPhone number to your Apple ID so you can send and receive iMessages from your phone number. You can also set up Text Message Forwarding so you can send and receive MMS and SMS messages on all of your Apple devices.

If you don’t have an iPhone, you can only send and receive messages with your Apple ID to other Apple devices using iMessage. To use iMessage, go to Settings > Messages > Send & Receive and make sure that you’re signed in with your Apple ID.

If you still can't send or receive messages, contact Apple Support.
If you don't receive SMS messages, contact your carrier.

Take care.