Not sure if this helps, but I hav programed an microcontroller wiht GSM-module to commuincate with HA over MQTT. This way I can send SMS with HA trough MQTT and the GSM-module.
Sadly i had not stated USA based…many of these options are more suited for European countries.
Whatsapp works also.
There is an integration that can send to groups also.
Or just use the HA app
Sprint email to text worked for 15 years, after being bought by Tmobile it worked only half the time. Switching to a t-mobile address was trash, if the message arrived it could be 1 to 24 hours old.
I switched to pushover and have been very happy, it is a one time fee.
What I would like to do now is find a service that uses a number in my area code to send messages to 911 over text for fire and medical emergencies.
Any recommendations?