Sending sms generally require to pay service price as per telecom rules. Wondering if there any rates for sending sms using api here
If you are using for application to person (A2P) you can use RingCentral Toll_Free sms feature
From Sandbox, the sms are for testing purpose and there will be a watermark on every sms text.
You can refer here for your answer:
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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