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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
406-437	MT	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	HELENA	HLNAMTMAMMD	07/27/2004	Prefix Type: CLEC Switch Name: HELENA Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAMMD))
406-437 is split into 1,000-number blocks - detail below
406-437-0XXX	MT	ONVOY, LLC - MT (Sinch)	0004323028	RMD0001966	453F	HELENA	NOCLLIKNOWN	08/30/2023	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
406-437-1XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0003290673	RMD0003382	6564	HELENA	HLNAMTMAX1X	03/10/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-437-2XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0003290673	RMD0003382	6564	HELENA	HLNAMTMAX1X	06/04/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-437-3XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0003290673	RMD0003382	6564	HELENA	HLNAMTMAX1X	08/17/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-437-4XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0003290673	RMD0003382	6564	HELENA	HLNAMTMAX1X	03/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-437-5XXX	MT	QWEST CORPORATION	0003746757	RMD0006389	9636	HELENA	HLNAMTMADS0	08/01/2008	Prefix Type: RBOC Switch Name: HELENA Switch Type: WECO 5ESS (Digital) LATA: Great Falls MT (648) Tandem: HLNAMTMA03T 🔧 Explore Switch(CLLI: HLNAMTMADS0))
406-437-6XXX	MT	QWEST CORPORATION	0003746757	RMD0006389	9636	HELENA	HLNAMTMADS0	08/01/2008	Prefix Type: RBOC Switch Name: HELENA Switch Type: WECO 5ESS (Digital) LATA: Great Falls MT (648) Tandem: HLNAMTMA03T 🔧 Explore Switch(CLLI: HLNAMTMADS0))
406-437-7XXX	MT	QWEST CORPORATION	0003746757	RMD0006389	9636	HELENA	HLNAMTMADS0	08/01/2008	Prefix Type: RBOC Switch Name: HELENA Switch Type: WECO 5ESS (Digital) LATA: Great Falls MT (648) Tandem: HLNAMTMA03T 🔧 Explore Switch(CLLI: HLNAMTMADS0))
406-437-8XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0003290673	RMD0003382	6564	HELENA	HLNAMTMAX1X	06/08/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-437-9XXX	MT	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	HELENA	HLNAMTMAMMD	07/27/2004	Prefix Type: CLEC Switch Name: HELENA Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAMMD))