The mobile phone receives short messages without a card.

When your card was placed in his mobile phone, the information was actually received in his mobile phone, but his mobile phone was delayed or did not remind him in time because of network reasons.

When his mobile phone is turned on again, it will prompt that there are new messages that have not been viewed, which is the same as turning off a message without reading it and prompting that there are new messages after turning on the phone.