Popular today, carrier-selection numbers are used to have a "secondary" long-distance carrier. Dial-around numbers allow you to choose a long-distance carrier call by call by adding 7 digits to each outgoing call. Much advertising has been done to have telephony users specify 10+XX+XXX to not use their primary carrier.

The reason for carrier selection is simple. You don't have to switch and can use different LD carriers based upon the time of day, week, location called, type of call, or personal preference.

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