Hey there,
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 cellular network connection. If you turn on Wi-Fi Calling, you can send SMS messages over Wi-Fi.
If you’re in a group message and stop receiving messages, check to see if you left the conversation. Open Messages and tap the group message. If you see a message that says you left the conversation, then either you left the conversation or you were removed from the group message. You can rejoin a group message only if someone in the group adds you.
To start a new group message:
- Open Messages and tap the Compose button .
- Enter the phone numbers or email addresses of your contacts.
- Type your message, then tap the Send button .
If you have other issues with a group message, you might need to delete the conversation and start a new one. To delete a group message:
- Open Messages and find the conversation that you want to delete.
- Swipe left over the conversation.
- Tap Delete.
When you delete a message, you can't recover it. If you want to save parts of a message, take a screenshot. To save an attachment in a message, tap the Download button . The photo or image will be saved to your Library in the Photos app.
For more info ☞ If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
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See ☞ Send a group text message on your iPhone, iPad, or iPod touch - Apple Support