[Observium] email to txt substitutes

hi, I guess i am behind the times but i just realized that the big 3 cell carriers in the US are (or have already) shutdown their email to txt gateways. we rely on this quite a bit. I know we could just send emails but our techs like a txt when things are really bad.

i was wondering what else others are using and what my options might be.

thanks in advance.