If your FCC license is not modified to reflect the 12.5 KHz efficiency standard (narrowband) you are operating in violation of the FCC's rules and could be subject to enforcement action, which may include admonishment, monetary fines or loss of license. 

FCC Website

Search for a license using Call Sign or FRN

Search to see if a radio is Narrowbandable

FCC Rules and Regulations

FCC part 90

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