I have just set up an account today and am now attempting to try out the various APIs within the sandbox account.
The first test I am attempting is literally just to send an SMS to my own mobile number via the QuickStart API section, where you can send the message via the UI.
Every time I try it I get the message "International SMS is not available for account". I am not based in the US, but surely in sandbox mode you can send SMS to numbers outside the US so that you can test the APIs?
Thanks for any advice.