If you go over your plan’s allotted minutes, the overage rate is calculated at your plan's overage rate. Current Plans have an overage of 3.9¢ / minute*.
*DETAILS: The 3.9¢ rate is assuming that your phone call used both the inbound leg and forwarding leg to complete the call. The inbound leg is calculated at 1.5¢ per minute, and the forwarding leg is calculated at 2.4¢ per minute. If your call uses both an inbound leg and a forwarding-leg, your overage charge is the sum of 1.5 + 2.4 = 3.9. If the call came into your Unitel Phone System and was not forwarded to you (only went to the virtual voicemail), then you would only be charged for the incoming-leg in overage for that call.