United States Cellular Corp. ( USM ), a subsidiary of Telephone and Data Systems Inc. ( TDS ) has reported first quarter 2012 earnings per share of 73 cents, 32 cents ahead of both, the Zacks Consensus Estimate and the year-ago earnings. The outperformance was driven by strong demand for smartphones and data services. Net income attributable to shareholders also increased 77.7% year over year to $62.5 million in the reported quarter. First quarter revenues of $1,092.1 million were ahead of the Zacks Consensus Estimate of $1,086 million and increased 3.3% from $1,057.1 million in the year-ago quarter driven by strong smartphone sales. Revenue, ARPU & Churn Quarterly Service revenue upped 4% year over year to $1,023.8 million.