If you set up a trial account with Twilio, there are some important limitations to keep in mind. For the full list, see https://support.twilio.com/hc/en-us/articles/223136107-How-does-Twilio-s-Free-Trial-work- Here's the specific limitation you're likely seeing: Outbound trial messages can only be placed to a validated phone number. Before attempting to place an outbound call, be sure to verify the number. Only numbers in the US and Canada can be reached by default; for help enabling messages to a desired country, please see our Global SMS on Trial Accounts article.
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