Alternatively, a user dials 101 + four-digit carrier code + area code + seven-digit number, and the call is handled by the carrier specified by the carrier code. The original batch of carrier codes began with 0, so this type of "dial around" service was typically marketed as dial-around 1010-xxx service. NANPA maintains separate lists of carrier codes for feature groups 'B' and 'D' as not all long-distance providers support both standards.
Alternatively, a user dials 101 + four-digit carrier code + area code + seven-digit number, and the call is handled by the carrier specified by the carrier code. The initial set of carrier codes began with 0, so this type of "dial around" service was commonly advertised as dial-around 1010-xxx service. NANPA maintains separate lists of carrier codes for feature groups 'B' and 'D', given that not all long-distance providers support both standards.