Make sure you are sending the message to a ten digit number and that the person you are messaging is actually capable of receiving the message.
Hello Chaseolson15. We want you to enjoy the use of MMS! Is this happening with all of your sent messages? What type of message app are you using? Have you tried deleting your messaging threads and starting new ones? Additionally, please try running the device in safe mode and testing with the factory messaging app. http://bit.ly/vW58PM
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