How do I listen to messages?

If you have made backups, you can restore your iPhone from iTunes or iCloud to recover messages. However, this will replace the existed on iPhone, so you can try recover old messages with a professional iPhone data recover PhoneRescue. How to Retrieve Deleted Text Messages from iPhone 6 Plus

This often has to do with a network error, or your phone its self. The best solutions are as follows.

1. Turn your phone off and turn it back on and attempt to retrieve the message again.
2. If that fails, ask the sender to resend the message.

If the above solutions do not work you might need to consult with your wireless provider.

1. If your message is received, you will see it in the INBOX folder.
2. If it has not been retrieved, retrieve it (make sure you have proper settings for the MMS to work). Highlight the message and click left softkey (options) and look for similar options to retrieve message from your network operator.
   
3. After you have retrieved it simply read like you are reading text messages.
   

BitPim will retrieve your SMS or text messages. You can view and/or browse thru them, and there is also an export and print option.

Good day, Your Message inbox is probably full, so you will have to delete some of your messages to allow space for the message to be retrieved.

You'll receive a text message stating "You have a reply to your Text to Land line message from XXX-XXX-XX-XX. Press TALK to listen to the reply." There is no charge for this notification.
This text message will contain the appropriate toll-free phone number which you can use to retrieve the voice-mail. To pick up the message, you must make the call from the mobile phone that received the notification. Standard airtime rates apply.

no u dont have to pay for anything all you have to do is send a picture to your self twice this activates the picture texting normally they activate them befor they ship them but sometimes they miss some. hope this helps

See there is a limit for the messaging just keep the words around 800 words and tehn send. if there is more then try sending it as two messages.

Click the ok button and then left scroll to:

"Messaging" screen
Scroll down to "Sent"
"OK"
this will give you all the messages you sent