GSM-A utilizes LTE Bands: 2 (1900MHz), 4 [66] (1700MHz), 5 (850MHz), 12 [17] (700MHz), 14 (FirstNet 700MHz), and 30 (2300MHz)

GSM-A utilizes 5G Bands: n5 (850MHz), n260 (39GHz)

High-Usage & Flat-Rate LTE Plans:

Nearly any device should work with this plan. Ideally it should be new to the AT&T network (has not been used with another account).

Flat-Rate Plan Exceptions (not eligible for use on flat-rate/high-usage plans):

• T-Mobile branded hotspots (such as Alcatel Linkzone, ZTE Z915, ZTE Z917, MF64 etc) are not compatible with high-usage, flat-rate or unlimited plans and can only be used on limited data plans (2 to 22GB).
• AT&T branded hotspots (such as ZTE MF275, MF279, Novatel 66xx etc) may have mixed results.
• Netgear LB1120 (As of November 1, 2021, lines found to be using this device may be disconnected by the carrier without warning, notice or recourse).
• Nighthawk M1 (MR1100-1A1NAS, MR1100-2A1NAS) (Update 5/20/2020: May not work at all on GSM-A - existing devices may continue to work until further notice, new activations not accepted). (As of November 1, 2021, lines found to be using this device may be disconnected by the carrier without warning, notice or recourse).
• Nighthawk M1 (MR1100-100NAS) (Update 5/20/2020: May not work at all on GSM-A - existing devices may continue to work until further notice, new activations not accepted). (As of November 1, 2021, lines found to be using this device may be disconnected by the carrier without warning, notice or recourse).
• Nighthawk MR1108 (As of November 1, 2021, lines found to be using this device may be disconnected by the carrier without warning, notice or recourse).
• GotW3 devices (C4R400 and GotW3 versions of the LTE520) should not be activated on GSM-A at all.

This list is subject to change and periodic updates. Last Update 2021-10-13.