Verizon came up short on the top line in its earnings report.Shares of Verizon Communications (VZ -4.50%) were falling today after the telecom giant posted disappointing revenue results on weakness in wireless equipment and due to a slow phone upgrade cycle.As of 11:44 a.m. ET, Verizon stock was down 4.3%. Verizon underwhelmsVerizon's core wireless service business continued to deliver steady growth, up 2.7% to $19.8 billion with 239,000 retail postpaid netphone additions, meaning monthly paying customers. ...