Welcome to the RingCentral Community

I am unable to add department number and Phone numbers to users and group in sand box, i have a existing ringcentral enterprise account which will have the phone numbers which is not a sandbox account. when i try to add those numbers in Sandbox it is not showing Area code.

Adding phone number to User:

when i try to add existing phone number, it is showing "0 existing numbers" left in Sandbox

Same i am facing for adding Department number also.