Is there a supplementary service to check if you read the text?

pu1. It's a service called mobile phone registered text service. You can read the details below

Sortation
content
In case of initial transfer failure
Registered text] 01/02 15:38, text sent to 01012345678 failed to be delivered due to power off, etc., resending
In the event of the last time
(24 hours or 12 hours)
Registered text] 01/02 15:38, The text sent to 01012345678 was not finally delivered.
Failure statement when transmitted as a missing number
Registered text] 01/02 15:38, The text sent to 01012345678 was not finally delivered.
Transmission success statement
Registered text] Your message to 01012345678 arrived successfully on 01/02 15:38.
The other party is in the number information series
in use
When transferring to a number before the change
Registered text] Due to the customer's circumstances, the message has not been confirmed. (017xxxxxxx)(03/10 11:00)
Failure statement when transmitting to MMS
"Message transmission failed because the number 01012345678 is not registered."
- Attempt to resend the original message that did not arrive for up to 24 hours, the same as a regular message
- If the notification message has not arrived, try to resend it for up to 24 hours, the same as the normal message
- The time shown in the message content is the initial transmission time of the message

2017-12-17

OK

pu2. It's a registered letter service. If you press the confirmation button to tell the other party that you have received it, it can be charged from the mobile phone bill. Therefore, if your plan does not include free text, it is better not to click OK

2017-12-17

OK