Yes. In order to do this, please call our customer support at 720-373-7000, and ask for a new international account. We will assign a customer account to you to be entered into the app, and provide the verification code for your new account. After that point, you can use the service like normal, using that assigned customer number wherever a phone number is requested.
If you ever forget what that number is, you can go to the "Check Balances" option in the top right menu of the app, and see it at the top of the screen.
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