Twilio phone number returns 'busy' for other callers but works for me

I'm experiencing an unusual behavior with my Twilio phone number:

• When I call the number, it works perfectly fine and connects
• However, when my friends try to call the same number, they get a "number is busy" message

Technical details:

• Using Twilio for voice calls
• The number is properly configured in my Twilio dashboard
• This behavior is consistent across multiple attempts

What I've tried:

• Verified the number is active in my Twilio account
• Confirmed the number is properly linked to my TwiML configuration
• Checked basic connectivity

Questions:

1. Why would this behavior be different for my calls versus others?
2. What configurations should I check to ensure the number works for all callers?
3. Could this be related to Geographic Permissions or Caller ID Filtering?

Any help identifying the cause and potential solutions would be greatly appreciated.

You mentioned in the comments that your account is in trial, which explains this behavior. You can solve the problem by upgrading your account.

Here is a subset of the trial restrictions:

• Outbound trial calls can only be placed to a validated phone number. Before attempting to place an outbound call, be sure to verify the number.
• Inbound trial calls can only be received from a validated phone number. Before attempting to receive an inbound call, be sure to verify the number.

Full list of limitations