With changes to our Business SMS, we're sharing some helpful KB articles that will help to clarify any questions you may have. Please feel free to use the comment section to leave additional feedback or questions that the Community Team will be glad to dig into further on your behalf.
https://support.ringcentral.com/article/Enhanced-Business-SMS-new-Price-Changes.html
https://support.ringcentral.com/article/RingCentral-Business-SMS-Frequently-Asked-Questions.html
https://support.ringcentral.com/article/High-Volume-SMS-Overview.html