Twilio

Overview:

Visit twilio.com to get an account and that gives you an Account SID and Auth Token (long long random letters and numbers.) and a unique phone number.

On Hubitat, create one (or more) virtual device(s) and assign it the Twilio driver.

Paste in the two Tokens from creating a Twilio account. Save.

Select the Phone number to send from and type the phone number to send to. Save.

Use the Twilio device(s) in Rules and Apps to send notifications.