Cannot Send SMS to any AT&T subscribers when using the Send SMS API. We can send to other providers with no problems at all
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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How can we make the outbound caller ID option ONLY the users DID and not selectable (in the desktop and mobile apps)? We do not want to provide users an option to spoof their outbound DID with any other number than their DID.