It's all stored, but don't worry, they won't access it.
Unless either of you have had any contact with any non-U.S. citizen potentially under scrutiny, or had any contact with anyone who may have had any contact with a non-U.S. citizen under scrutiny.
This is the new law, the old law allowed three hops (so append "or had any contact with anyone who had any contact with anyone who had any contact with a non-U.S. citizen who may be under scrutiny")
edit: Unless your or your mother are non-U.S. citizens who may be under scrutiny yourselves, in which case they may have listened to you and your mother on the phone. But if you've got nothing to hide, what are you worried about?
Unless either of you have had any contact with any non-U.S. citizen potentially under scrutiny, or had any contact with anyone who may have had any contact with a non-U.S. citizen under scrutiny.
This is the new law, the old law allowed three hops (so append "or had any contact with anyone who had any contact with anyone who had any contact with a non-U.S. citizen who may be under scrutiny")
edit: Unless your or your mother are non-U.S. citizens who may be under scrutiny yourselves, in which case they may have listened to you and your mother on the phone. But if you've got nothing to hide, what are you worried about?