Smartphone sales may increase postpaid subscriber additions and bring in juicy data revenues, but they are also very expensive due to the huge subsidies that carriers provide in return for long-term contract plans.
"Following a combination of an underlying increasein network traffic as well as a high rate of new customer additions, we are aware of capacity issues in a small number of exchanges, " she said.
In fourth-quarter 2012, Verizon Wireless delivered the highest number of retail postpaid net additions of any quarter in its history, strong growth in revenues, an increasein smartphone penetration, and continued low retail postpaid churn.