You can purchase a voice-enabled Twilio number and connect it to your Nyaruka account in minutes, or, if you're in a country where Twilio doesn't yet provide virtual numbers, you can either try Nexmo or test your voice flows with an Android channel (see process here). 

Note: Twilio trial numbers are not sufficient for testing- you will not be able to send or receive real messages with a trial number!

You can add a voice-enabled Twilio number by following the steps outlined here. Make sure to check the Voice capability in addition to SMS:

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