Text to multiple Sending problem

If you still can't send or receive MMS, follow these steps

1. Make sure that the contact trying to message you isn't blocked in Settings > Messages > Blocked.
2. Go to Settings > Messages and turn on group messaging if you're sending a group message.
3. Make sure that you're using the area code with the contact's phone number. When you send messages internationally, you also need the contact's international code.
4. If you're using a "Pay as you go" MMS plan, make sure it has enough available balance. If you're unsure of your MMS plan or available balance, contact your carrier.
5. If the issue occurs with a specific contact or contacts, back up or forward important messages and delete your current messaging threads with the contact. Create a new message to the contact and try again.
6. If the issue occurs with a specific contact or contacts, delete and recreate the contact from the Contacts app. Send a new message to the new contact.
7. Back up and restore your iPhone as new.
8. If your carrier has recently ported your phone number, the porting process might not be complete. Contact your carrier to confirm that the porting process is complete.
9. Contact your carrier to verify that you're provisioned to send SMS and are in an area with cellular coverage.
10. Contact your carrier to verify that there aren't blocks or filters on your wireless account preventing you from sending SMS.
11. Your carrier might require modified APN settings to use MMS.