If it refers to your preset mobile phone signature information (such as mood, jokes, etc. ) will be displayed in the form of text on the other party's mobile phone during your call. It is a mobile phone signature service, and you must turn on the ringtone before using it. Prepaid users can't modify their signatures through SMS, so they can only log in; Post-paid users can edit "G mobile phone signature content" (maximum 48 words) and send it to "106604 15". For example, if the user sends "Happy National Day G" to "10604 15", the signature content can be changed to "Happy National Day". (Note: The content of the self-designed mobile phone signature needs to be reviewed before it can take effect. The review reply time is: 9:00 am-9: 00 pm, and the signature will take effect within 30 minutes; 9:00 pm-9: 00 am and before 9: 30 am, the audit will take effect. )