Starlink was approved by the FCC to run a limited test in North Carolina and Florida in the damage pads of the two hurricanes and it's doing pretty good as well. With their system, anybody on any carrier can get wireless emergency alerts and currently T-Mobile customers can send and receive text messages.

Edit: I would like to expand on my word of limited above. It is actually in very early experimental stages, and they say that coverage will be spotty, and it could take 15 minutes to send and receive a message. They say if you are receiving it, your phone will show 1 to 2 bars like it would on the regular cellular network, but it will say T-Mobile Starlink at the top as the carrier name

Edit 2: Any phone that knows how to talk to the cellular network would be able to be used with this service. With the current technology, like the iPhone has, you are basically getting hardware that knows how to talk to the satellite. Where in this trial, they are putting the hardware on the satellite that can talk with your phone.