Question: What action should a User Equipment (UE) take when receiving a Short Message Service (SMS) with a 'Reserved' value in the TP-Message-Type-Indicator (TP-MTI), according to 3GPP standards?
Option 1: Discard the message due to unknown type
Option 2: Process the message as if it were an 'SMS-DELIVER' and store it exactly as received
Option 3: Send an error report back to the Short Message Service Center (SC)
Option 4: Request retransmission of the message from the SC
Explanation: When a UE encounters a 'Reserved' value in the TP-MTI, it should treat the message as if it were an 'SMS-DELIVER' for processing purposes but must store the original message without alteration, ensuring compatibility and preventing potential message loss due to unrecognized types.