Our 10-10 access numbers are not available in all areas and may be changed or removed in the regular course of maintaining or retiring our network facilities. You may therefore hear a message that your call cannot be completed when dialing a 1010 number in your area. You may still access and place calls over our network by selecting Verizon (MCI) as the preferred carrier for your lines or you may explore other calling options and plans at www.mci.com.