What are the GSM carriers in the USA?

GSM Carriers in the USA (source Full list of GSM Carriers in the US for Low Vision Smartphones)

Some of these have been recently purchased, but at one point they all had GSM systems

• Airfire Mobile
• ASTAC
• Asset/Vada Wireless (uses AT&T/ TMobile)
• AT&T (Includes GoPhone Prepaid, Dobson Cellular, Edge Wireless and Centennial Wireless)
• Broadpoint
• Big Sky Mobile
• Calhan Wireless
• call4care
• Cellular One of East Central Illinois
• Cellular One of East Arizona
• Cellular One Nation
• Cellular One TXOK
• Chariton Valley Wireless
• Cincinnati Bell Wireless
• Commnet Wireless (also uses CDMA)
• Consumer Cellular (uses AT&T towers)
• Cordova Wireless
• Corr Wireless
• Cross Communications
• DTC Wireless
• Earthtones
• Epic PCS
• Fuzion Mobile
• GCI Wireless (also uses CDMA)
• GTC Wireless (uses AT&T towers)
• GoSmart Mobile
• i wireless
• Immix
• Indigo Wireless
• Jolt Wireless (uses AT&T towers)
• KTC PACE
• Locus Mobile (uses CDMA, Verizon & AT&T towers)
• Long Lines Wireless
• Mobal Freedom (uses AT&T towers)
• Metro PCS (also uses CDMA)
• NEP Wireless
• Pine Cellular
• Plateau Wireless
• Pure Prepaid (uses AT&T towers)
• Pure Talk USA (uses AT&T towers)
• Simple Mobile (uses T-Mobile towers)
• Shaka Mobile (also uses CDMA, Verizon & Sprint towers)
• Telecom North America Mobile Inc
• TerreStar
• T-Mobile USA
• TracFone Wireless non MVNO (also uses CDMA, AT&T, Verizon, Sprint, US Cellular and T-Mobile towers as MVNO) Includes NET10 Wireless, SafeLink Wireless, Straight Talk, SIMPLE Mobile and Telcel América
• Tru (uses T-Mobile towers)
• Union Wireless
• Viaero Wireless
• Wal-Mart Family Mobile (uses T-Mobile towers)
• West Central Wireless
• Westlink
• XIT Communications