Can I use a non-Twilio number as the caller ID for outgoing calls?
Yes, just verify the number with Twilio. Verification takes just a few seconds, and proves to us that you have authority to use the phone number. Sorry, no prank calls from your bro’s phone number! Once the phone number has been verified, it can be used with the ‘callerID’ attribute for your outbound calls.
If you’re planning to use Twilio to provide a service to end users, you can also use our REST API to verify individual caller IDs programmatically.