Will I be charged for calls to disconnected numbers?
It depends. There are a few different ways a number you’re attempting to call may be disconnected.
If the number is not a valid number, then Twilio will be unsuccessful in executing the phone call. If that’s the case, Twilio will mark the call status as “Failed,” and your account won’t be charged.
Other times, a number is disconnected because it belongs to a user who is delinquent. The carrier actually accepts the call. Then, their internal business logic determines that it should play an error message to the caller instead of ringing through. If that’s the case, Twilio marks the call status as “Completed,” and your account will be charged for the brief period it was connected.