The Federal Communications Commission (FCC) is an independent agency of the United States government created by statute to regulate interstate communications by radio, television, wire, satellite, and cable.
A Final Negative notification is returned when a message cannot be delivered and a retry will not be attempted. The returned status code indicates to the customer whether the message is retriable or not, in which case the customer can initiate their own retry process. Note: Certain operators charge for retry attempts. It is therefore recommended that you consult with your Account Manager to understand any specific caveats on retries in your market. There are no additional notifications sent after a final negative status.
A final positive notification is returned when the message has been delivered to the operator or SMS-C (when no handset Ack is requested or the operator does not support handset Ack) or to the handset (when a handset Ack is requested). In both cases, the status is final, and no additional notifications will be sent for that message.
FTEU (Free to End User) enables enterprises to send messages in a way that ensures the end user does not get charged by the mobile operator. These fees are paid by the content provider/customer, that is, only the business sending the message is charged for the message. Example. “FREE MSG:“, meaning that the message doesn’t get charged to the end user's wireless phone bill.