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Description:In the CSFB procedure, we found the authentication step is missing. The result is that an attacker can hijack the victim's communication. We named this attack as 'Ghost Telephonist. When the call or SMS is not encrypted, or weakly encrypted, the attacker can get the content of the victim's call and SMS. Furthermore, Telephonist Attack can obtain the victim's phone number and then use the phone number to make advanced attack, e.