When an SMS is sent to a Telecommunications Service Provider, they return a delivery receipt. Telecommunications Service Providers send the delivery receipt at a moment of their choice, not actually having to wait for delivery confirmation. A delivery receipt can be either: Carrier – returned to the message deliverer when the message is received by the Telecommunications Service Providers. Handset – returned to the message deliverer when the message is received on your user’s handset.
In practice, some Telecommunications Service Providers either do not send the delivery receipt or send a fake delivery receipt . Unfortunately no message deliverer can be 100% certain that a ‘successfully delivered’ delivery receipt actually means that the message reached the user. If the message is not received, this delivery receipt explains why the message failed to arrive.
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