Use the Free plan – and only pay for resources that you use – or go for a paid plan, which gives you discounted pricing and more support.
The Free plan includes a few days of “get started” support when you start using our API. Assistance beyond that, usually requires a paid plan.
Phone numbers can be purchased as “plain vanilla” or with a business package that gives access to additional features. Here is a summary of the differences.
Phone number price examples are based on US local phone numbers with longer subscriptions. With Enterprise plans you get $1 additional discount per number and month. Volume discounts are additionally available.
The full price list can be found here (PDF).