Exhibit 3.19

State of Delaware
Secretary of State
Division of Corporations
Delivered 05:04 PM 08/29/2014
FILED 04:47 PM 08/29/2014
SRV 141127462 - 5595378 FILE

SNR WIRELESS LICENSECO, LLC

CERTIFICATE OF FORMATION

This Certificate of Formation of SNR Wireless LicenseCo, LLC, dated August 29, 2014, is being duly executed and filed by the undersigned, as an authorized person, to form a limited liability company under the Delaware Limited Liability Company Act.

FIRST:      The name of the limited liability company (hereinafter, the "LLC") formed hereby is:

SNR Wireless LicenscCo, LLC

SECOND: The address of the registered office of the LLC in the State of Delaware is 2711 Centerville Road, Suite 400, Wilmington, Delaware 19808. The name of the registered agent as such address is Corporation Service Company.

-Signature page follows-

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation as of the date first above written.

/s/Andrea Barr Cohen 

Authorized Person