T-Mobile is offering Starlink texting to cellphones, but it's currently in a limited beta phase:

T-Mobile opened registration for the Starlink direct-to-cell satellite service beta program on December 16, 2024.
The satellite cellphone texting beta test is starting soon, but the new beta testing is for internet (data) connections via Starlink.
Initially, the service will support texting only, with voice and data planned for the future.

Availability and Eligibility

The texting beta is open to all T-Mobile postpaid voice customers.
It's free for participants during the beta test.
Currently, only select Samsung models are compatible:
Galaxy Z Flip 6 5G
Galaxy Z Fold 6 5G
Galaxy S24 5G
Galaxy S24 Plus 5G
Galaxy S24 Ultra 5G