Where can I read text messages when I turn it off?

When the phone is turned on again, you can usually receive a text message within 24 hours.

After the short message is sent, it will first arrive at the operator's server, which will temporarily store it. The server will wait for the receiver's mobile phone to be turned on and establish a connection with it, and then send the temporary short message to the receiver's mobile phone. This temporary storage time is usually 24 hours. If the receiver's mobile phone is turned on again within 24 hours, they can receive these short messages temporarily stored during the shutdown period.