Outbound Text Message
It's a operator message. Your SIM card need to send a message to the operator to inform something about your phone (like you are using a new phone) but the receiver don't recognize for what the message is. Your sim card will keep sending the message until it receives a valid response.
Try to change the SIM card and see what happens. If the problem appears only with one card, you may ask your carrier company to change it.
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