The following types of delivery receipts are available for TFN:
Network delivery receipt - which basically relays to the brand that a message has been sent to a carrier.
Handset delivery receipt - The second, more important delivery receipt is the handset delivery receipt which originates from a consumer's handset and confirms that message has been received at the handset. Sinch passes these handset delivery receipts on to you, so you know when a message has been received on the phone. These are supported on Toll-Free numbers to ensure complete transparency of what happens to each one of your messages.