T-Mobile US customers were the largest users of the operator's direct-to-device (D2D) satellite service with Starlink as of September.
However, AT&T users were the second largest group, according to research by network performance measurement company Ookla.
T-Mobile's satellite service, provisioned by Starlink, launched nationwide in July after six months of beta testing.
The service is available free for subscribers of T-Mobile's Experience Beyond or Go5G Next plans, and for $10 per month for a limited time for other users, before increasing to $15 per month.
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Author's summary: T-Mobile US and AT&T customers use D2D satellite service.