Thanks, Ken, and good morning, everyone. I'll begin with a few additional comments on customer results, shown on Slide 6. Postpaid gross additions for the second quarter of 2015 were 191,000, essentially flat with the results a year ago. Postpaid churn was one of the real highlights for the quarter, 1.34%: down from 1.73% last year. I'll say more about postpaid churn in a minute. Due to both higher gross additions and improved churn, we achieved postpaid net additions of 17,000 for the quarter, a solid improvement from the net loss of 26,000 postpaid customers a year ago. The mix of our postpaid gross and net additions in the second quarter is shown in the chart at the bottom of the slide. Smartphones represented 60% of gross additions and connected devices represented 32%. These 2 categories of devices also drove the net additions. Prepaid subscriber results also were improved over a year ago. We had 8,000 net additions versus 4,000 net losses last year, while churn improved to 5.2% from 6.5%.
The next slide has a chart showing the trend in the postpaid churn rate over the past 9 quarters. As you can see, the churn rate has steadily declined over the past several quarters from a high point of 2.29% in the first quarter of 2014 to 1.34% for this past quarter. To repeat Ken's comment earlier, the last time that we reported churn this low was in the first quarter of 2007, more than 8 years ago. As stated earlier, our gross additions consist primarily of data-centric devices, with smartphones being the largest component.
To shed further light on this activity, Slide 8 shows the trends in smartphone sales and penetration. During the second quarter of 2015, we sold 437,000 smartphones, which represented 87% of total handsets sold. This drove smartphone penetration to 69% of our base of postpaid handset customers, up from 58% a year ago. So at the end of the second quarter, we still had 31% of our postpaid handset customers with basic phones. We continue to work aggressively with targeted offers to upgrade these customers to smartphones and thereby drive additional data usage revenues.
During the second quarter of 2015, we also sold 62,000 connected devices. Along with a higher penetration for smartphones and connected devices, we're also seeing more customers adopt our Shared Connect data plans. Penetration on these plans is now 65%, up from 47% at year-end and 22% a year ago. Getting more customers on data-centric devices and shared data plans is critical to the strategy of monetizing the growth in data usage.
The next slide illustrates just how much that data usage has continued to grow over the past 6 quarters. During the second quarter of 2015, data subscribers on our network used an average of almost 1.5 gigabits of data per month. That's an increase of 14% over the amount that they were using a year ago. And we're seeing that usage have a positive impact on revenue from customers. Postpaid ARPU, as reported, was $53.62 for the second quarter of 2015, down $3.20 or 6% year-over-year. However, there are a lot of moving parts in ARPU, price competition, significant growth in data usage, discounts related to installment plans, just to name a few, and consequently, the reported number doesn't tell the whole story. When you look through it, the pricing and usage impacts have been largely offsetting. The equipment installment plans have resulted in a shift of some service plan revenue to equipment revenue. When we consider ARPU and the EIP billings together, we see that the year-over-year change is actually an increase of about 1%, not a decrease of 6%. There's a similar story for average revenue per account. The as-reported numbers show an increase of 1% year-over-year but when we consider the EIP billings, the increase is actually about 8% year-over-year.
Total operating revenues for the second quarter were $976 million, up $18 million or 2% from $958 million a year ago. The increase was driven primarily by higher equipment sales revenues reflecting the growth in equipment installment plan sales. Service revenues were $824 million, down $19 million or 2% from last year. There were 2 principal factors. Number one, lower retail service revenues. Although we had an increase in customers year-over-year, the impact of that growth was offset by the decrease in reported ARPU discussed earlier. Number two, inbound roaming revenues of $49 million decreased $9 million or 15% due to lower volume for voice traffic and lower rates for both voice and data traffic.
Our overall financial performance for the quarter was quite strong, as shown on the next slide. Operating cash flow for the quarter was $163 million, up significantly from $94 million a year ago. That's an increase of $69 million or 73%. Several factors contributed to the improvement. First, as I just discussed in more detail, total operating revenues grew by $18 million or 2% year-over-year. Total cash expenses were $813 million, down $50 million or 6% year-over-year. System operations expenses increased by $9 million or 5%, primarily due to outbound roaming expense. However, reductions in cost of equipment and SG&A expenses more than offset that increase. Cost of equipment sold fell $18 million or 7%, driven by fewer upgrade transactions. SG&A expenses fell by $41 million or 10%. Significant factors in that decrease were lower consulting costs and bad debts expense related to the billing system conversion last year, reductions in sales, employee and commissions expenses and lower roaming administration fees. This chart also highlights our true operating performance for the quarter. As you can see at the bottom of the slide, our operating income, excluding the nonrecurring gains or losses in both periods, dramatically improved from a loss of $54 million last year to income of $12 million this year.
Adjusted EBITDA, shown next, incorporates the earnings from our equity method partnerships and imputed interest income from EIP transactions. Adjusted EBITDA for the quarter was $207 million, up 61% from $129 million last year, driven largely by the increase in operating cash flow. Earnings from unconsolidated entities were $36 million, including $19 million from the L.A. partnership.
As disclosed in June, and again in our Form 10-Q report for the second quarter, we've been informed by the general partner of the L.A. partnership that the general partner in the L.A. partnership have entered into a transaction with respect to a spectrum license in the L.A. partnership's market acquired by the general partner in FCC Auction 97. We've also been informed by the general partner that cash distributions from the L.A. partnership will be suspended until the general partner has been paid for the spectrum license. Accordingly, we do not expect a cash distribution in 2015. By comparison, we received cash distributions of approximately $60 million in 2014. Cash distributions from the L.A. partnership do not affect the measurement of operating cash flow or adjusted EBITDA, nor will the reduction in the cash distribution for 2015 have a significant effect on U.S. Cellular's liquidity or financial flexibility.
The strong results for the second quarter influenced our thinking about expected full year 2015 performance and led to our determination that we should increase the guidance for the operating cash flow and adjusted EBITDA measures. The updated guidance is shown on Slide 14 of the presentation. For total operating revenues, we have lowered the top end of the range by $100 million so that the range is now $4.0 billion to $4.1 billion. This reflects somewhat lower customer growth and EIP participation than originally expected. For operating cash flow, we're raising the range by $40 million at both ends to $440 million to $540 million. This increase balances the positive performance in the first half with the fact that we still have an intensely competitive market with a lot of pricing uncertainty and our assumptions about the level of promotional activity that we expect to see, especially in the fourth quarter. The increase for operating cash flow carries through to the guidance for adjusted EBITDA, along with updated estimates for earnings from our equity method partnerships and interest income, both of which have come down a bit. So we're raising the range by $20 million at both ends, with the new guidance for adjusted EBITDA being $600 million to $700 million.
And finally, capital expenditures are still expected to be approximately $600 million. Note that the guidance does not incorporate any potential benefit that might result from the termination of our reward points program on September 1. At this time, there's still too much uncertainty related to the number of points redeemed and how they are used. As of June 30th, the balance of deferred revenue related to the unredeemed points was $81 million.
Finally, I'll make just a couple of brief comments about U.S. Cellular's cash position. As of June 30, cash and equivalents totaled $362 million, up $151 million from the year-end level. In July, we borrowed the $225 million available under our term loan facility. In addition to these funds on hand, we have about $282 million of unused borrowing capacity under our revolving credit agreement. We believe that these resources, together with expected cash flows from operating activities, will be sufficient to meet our day-to-day operating needs for the foreseeable future.
Now let me turn the call over to Vicki Villacrez to discuss TDS Telecom. Vicki?