Adding a new phone number to your validated numbers is quick and easy:
$client = new Services_Twilio('AC123', '123');
$response = $client->account->outgoing_caller_ids->create('+15554441234');
print $response->validation_code;
Twilio will call the provided number and for the validation code to be entered.
Show all the current caller_ids:
$client = new Services_Twilio('AC123', '123');
foreach ($client->account->outgoing_caller_ids as $caller_id) {
print $caller_id->friendly_name;
}