The selected sandbox account doesn’t support SMS feature. Contact Customer Support if needed!
Please Enable SmsSender in Sandbox account ::
SMS enabled. Please retest.
Please don't post on other's thread. Especially when it is resolved.
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:
8 People are following this question.