Can my daughter's mobile phone see the message sent by my mother's mobile phone?

Unless there is a possibility, it is the No.1 coseismic (two telephones, one is a landline and the other is a mobile phone. The No.1 coseismic needs to be handled by someone inside the communication company. Mother and daughter's phone belongs to serial line, but it can't be set to answer the phone at the same time. Mother and daughter can answer the phone at the same time, and when a phone comes in, it will ring at the same time, but as long as one party answers the phone, the other party can't.