The following links are useful to track down who is responsible for signs.
Each reputable telephone carrier provides a method for law enforcement to determine the identification of the owner of unlisted telephone numbers. While "drug dealer" (or "burner") phones can't be found, others can be using these tools.
Number Portability Admin Center (account required) - to find out which carrier services the number, then contact carrier:
T-Mobile, Law Enforcement Relations department, 973-292-8911
Verizon, Law Enforcement Resource Team
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Updated 5 Dec 2018 by MAP