i have tried to send sms using this porduction activated number +18442245264 but its shows error message as "The requested feature is not available ". plz help me out soon...
You can check same issue posted here already as reference: https://community.ringcentral.com/questions/9704/reg-msg-242.html
Not sure how you chose the number but it seems the phone number does not have SMS cap.
There are lots of discussions about most of the topics/errors you have been asking here. You can always search from the forum to get solutions before posting your questions. Or provide better background info of how you send SMS.
Search for "MSG-242 error" to see previous discussions.
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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