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The problem of mobile phone short message

Mobile phone to mobile phone receiving and sending process: source mobile phone-base station-SMS center-base station-destination mobile phone.

SP- Mobile phone process: SP- SMS gateway (including gateway-to-gateway forwarding)-SMS center-base station-destination mobile phone.

Short message is a data transmission oriented to non-connection, which means that the other party (mobile phone or SP) can send short messages to the mobile phone whether it is turned on or not.

These short messages are temporarily stored in SC (Service Center). When the receiver's mobile phone is turned on or can receive, SC will send the stored short message to it.

But the storage time of SC is determined by its operator, which is generally 24 hours.