> In Brazil, to dial numbers internally but across a certain geographical boundary, a carrier code must be explicitly dialed to say which carrier you will use t

> In Brazil, to dial numbers internally but across a certain geographical boundary, a carrier code must be explicitly dialed to say which carrier you will use to pay for the call. Any Brazilians here who can confirm whether this is true? I know that in Brazil you can select a preferred carrier for a long-distance phone call by dialing a prefix. For example, you'd dial 014 ahead of your phone number to choose Brasil Telecom or 021 to choose Claro. But this is optional as far as I know. If you don't dial any prefix, you get a default carrier.