I'm trying to send SMS through API. I'm getting the same errors as in https://devcommunity.ringcentral.com/ringcentraldev/topics/send-sms-via-curl-request , so I'm trying to follow the same guide. However I am not able to add Phone for my second account, whenever I click - I get error message "No numbers available in selected area - please select an alternate area".
By the way, is there any guide how to set up the simplest user with free-only services just to test SMS messages? As it is a requirement for an App to go through Sandbox first I assume there is some free way to test it, but unfortunately I have not yet found it.
Thank you in advance for help.