@Phong Vu We need the SMS feature of our sandbox numbers enabled for testing and after testing same number we have to convert into prod. Our sandbox main phone number is: +16502572459
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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