| 30 Second Billing Increments |
Call costs are calculated (in part, at least) by finding the number of billing increments used (in this case 30 seconds), and multiplying by the billing rate per increment. For example: 30 second billing increment phone plans will charge the same amount for call durations 6 sec, 14 sec, and 30 sec. They will also charge the same for calls which are 31 sec, 44 sec and 60 seconds.
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