Sending text messages failed for several days.

At present, China Unicom operators will store 48 hours of receiving allowance for you in the core network. If you don't receive SMS for more than 48 hours due to power failure, no signal, etc., it will be defined as junk data for cleaning.

When sending a short message, if the other party is turned off or out of service, the short message will be stored in the short message center for 48 hours. If the other party turns on the phone within 48 hours, the other party will receive the text message immediately. If it is not turned on for more than 48 hours, the SMS center will delete the message and prompt the sender that the sending failed. Even if it is turned on later, the receiver will not receive this message and any prompt.

Extended data

When the mobile phone is in a normal state and can't receive information in time due to reasons such as power off or out of service area, the storage time of information is as follows:

1. The storage time of point-to-point short messages in the network is 72 hours.

2. The SMS storage time of other operators is 48 hours.

3. The SMS storage time of Monternet SP, self-owned business, group answering customers and 10086 is 24 hours.