For Frontier, when you hear a dial tone, dial  *72. You should hear a second dial tone, dial the number you want your calls forwarded to. Call Forwarding is activated when someone answers the number you dialed. For call forward busy, dial *90. Listen for a special dial tone, dial the number that you want your calls forwarded to, followed by the # sign and hang up. For call forward no answer, dial *92, and listen for a special dial tone, then enter the number of rings to allow before forwarding.