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I am going to assume that this is in COUNTY COURT.
1) A Subpoena Duces Tecum is filled out. See HERE.
2) It is taken the Court. The clerk will have to sign off on it. They may or may not have the Judge look at it as well.
3) Once it is signed off on (assuming it is), then one sends a copy to the third party (telephone company) which holds the records, and
4) A courtesy copy can be sent to the opposing party.
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