Why can't the text message be sent out, which means it was sent successfully?

This has nothing to do with the machine, but what you subscribe to. You can send "00000" to 18620 1 to cancel all subscriptions, or send "0000" to 18620 1 to find out what you have subscribed to.

Short Message Service (SMS for short) refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters. ?

On April 8, 2020, China Telecom, China Mobile and China Unicom jointly issued the White Paper on 5G SMS, which made the basic SMS service in China enter a comprehensive upgrade channel, and the traditional SMS will be gradually replaced by 5G SMS (RCS service). ?

SMS was born.

1992, when the world's first short message was successfully sent to a mobile phone through a PC on the GSM network in Wolfen, England, no one would have thought that this low-cost short message service was originally introduced by telecom operators to solve the high telephone bill.

This seemingly naive communication will have such a huge impact on people's economic and cultural life and even politics after many years.