What is the purpose of having 1 TM ID for the account vs 1 TM ID per line?




    I'm trying to understand that purpose TM IDs.  I just switched over from another carrier and have two lines, one for me and the other for my wife and at some point another line for my kiddo.  I notice that my line (main line) has a TM associated to it and the second line does not.  I would like to have a separate Caller ID name for each line and trying to understand if the TM ID is what it is used for or does it serve another purpose.




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