Jessica Fischer
Chief Financial Officer at Charter Communications
Thanks Chris. Let's turn to our customer results on slide five. Including residential and SMB, we lost 72,000 Internet customers in the first quarter and video customers declined by 405,000. In mobile, we added 486,000 mobile lines and wireline voice customers declined by 279,000. Our mobile product continued to perform well. And although we saw lower mobile gross adds year-over-year tied to lower gross Internet additions, we also saw lower overall -- lower overall mobile churn rate year-over-year and sequentially.
Customers who signed-up for our Spectrum One product in the first quarter of 2023 reached their 12-month anniversary this past quarter. Similar to last quarter, those promotional roll-offs did not drive incremental Internet churn. In fact, our Internet churn rate also declined year-over-year. So as we always expected, Spectrum One lines are performing well and our converged offering drives higher mobile sales and longer customer lifetimes.
Turning to rural, we ended the quarter with 493,000 subsidized rural passings. And we grew those passings by 324,000 over the last 12 months and 73,000 in the first quarter. It's a bit of a slowdown from Q4 as we noted it would be on our last call given winter construction seasonality. Penetration growth continues to exceed our expectations and customer growth in our subsidized rural footprint increased with 35,000 net customer additions in the quarter. We continue to expect to activate approximately 450,000 new subsidized rural passings in 2024, about 50% more than in 2023. We also continue to expect our RDOF build to be completed by the end of 2026, two years ahead of schedule.
The RDOF and ARPA program rules have been successful in driving large scale private capital builds. With respect to BEAD, most of the state's rules are still working through the NTIA review process. We expect some states will have a regulatory environment conducive to private investment, while others will not. And we'll be disciplined in our investment approach with the continued expectation that some opportunities with appropriate ROIs will be available.
Before turning to our financial results, I wanted to make a few comments regarding the Affordable Connectivity Program. An ACP renewal now appears unlikely for the program's 23 million recipients nationwide and for our 5.0 million Internet customers receiving a subsidy. We will do everything we can to preserve our relationship with the ACP subsidy recipients and we expect to keep the vast majority of them as customers. We have a number of ways to assist those that may lose their ACP subsidy, including our Spectrum Internet Assist program and Internet 100 product. We're also offering all of our ACP customers a free mobile line for one year. The success of our Spectrum One offering has shown that we can create long-term converged connectivity customers by saving consumers hundreds or even thousands of dollars on their mobile bill. And even after the initial promotional period ends, we will still be able to save these customers the equivalent or more than the $30 ACP subsidy benefit that they are currently receiving. The majority of ACP recipients in our customer base were Internet customers before the start of the ACP program and the vast majority of our ACP customers also pay something out-of-pocket for their Internet service. Ultimately, we will lose some customers and our Internet ARPU and bad debt expense may have one-time pressure, but we expect the impact to Charter to be mostly limited to the second and third quarters of this year and we will provide transparency for those impacts in our quarterly reporting.
Moving to the first quarter financial results, starting on slide six. Over the last year, residential customers declined by 0.7%, driven by video only customer churn. Residential revenue per customer relationship declined 0.1% year-over-year. Given a higher mix of non-video customers and growth of lower priced video packages within our base, mostly offset by promotional rate step-ups, rate adjustments and the growth of Spectrum Mobile. As slide six shows, in total, residential revenue declined by 0.4% year-over-year.
Turning to commercial, SMB revenue declined by 0.3% year-over-year, reflecting lower monthly SMB revenue per SMB customer, primarily due to a higher mix of lower priced video packages and a lower number of voice lines per SMB customer. These factors were slightly offset by SMB customer growth of 0.2% year-over-year. Enterprise revenue grew 3.8% year-over-year, driven by enterprise PSU growth of 6.9% year-over-year. Excluding all wholesale revenue, enterprise revenue grew by 5.5%.
First quarter advertising revenue grew by 10% year-over-year given political revenue growth and core ad revenue was essentially flat year-over-year. Other revenue grew by 2.4% year-over-year, primarily driven by higher mobile device sales. And in total, consolidated first quarter revenue was up 0.2% year-over-year and down 0.1% year-over-year when excluding advertising.
Moving to operating expenses and adjusted EBITDA on slide seven. In the first quarter, total operating expenses declined by 1.5% year-over-year. Programming -- programming costs declined by 8.2% year-over-year due to the decline in video customers of 8% year-over-year and a higher mix of lighter video packages. These factors were partly offset by higher programming rates and first-quarter 2024 programming costs include around $30 million of favorable adjustments versus $50 million of favorable adjustments in the prior year period.
Other costs of revenue increased by 9.8%, primarily driven by mobile service direct costs and higher mobile device sales. Cost to service customers were essentially flat year-over-year with additional activity to support the growth of Spectrum Mobile and higher bad debt expense, mostly offset by lower service transactions per customer, including productivity from 10-year investments. Sales and marketing costs declined by 2.7%, primarily driven by lower labor costs, partly tied to lower Connect volumes. Finally, other expense grew by 0.5%.
Adjusted EBITDA grew by 2.8% year-over-year in the quarter. And when excluding advertising, EBITDA grew by 2.2% year-over-year. Looking ahead, our goal is to deliver solid EBITDA growth and we believe we can do that even as we make significant investments in the business, face a challenging competitive environment and reach the likely end-of-the ACP program. Our residential revenue will be supported by Internet ARPU growth and our growing mobile customer base. In addition, mobile's contribution to EBITDA continues to improve as the business scales. We've also lapped the significant investments that we made in our employee base, so the related EBITDA drag should be mostly behind us.
And finally, we continue to carefully manage our expenses across the business. And while we're not going to do anything that would impact our sales or service capabilities, this quarter's cost-to-service customers and sales and marketing expense results demonstrate our ability to drive efficiencies into the business. In the second quarter, we will face some tough expense comparisons, particularly in other expense as well as ACP headwinds. So while our second quarter EBITDA growth will be muted, our expense management process is clearly working and financial growth in the back-half of the year should accelerate given our expense management initiatives, Spectrum One promotional roll-off and political advertising revenue.
Turning to net income on slide eight. We generated $1.1 billion of net income attributable to Charter shareholders in the first quarter, up from $1 billion last year, driven by higher adjusted EBITDA and a gain on the sale of towers, partly offset by higher income tax and interest expenses.
Turning to slide nine. Capital expenditures totaled $2.8 billion in the first quarter, about $325 million above last year's first quarter spend. Line extensions totaled $1 billion, $69 million higher than last year, driven by our subsidized rural construction initiative and increased residential and commercial greenfield and market fill-in opportunities.
First quarter capital expenditures, excluding line extensions totaled $1.8 billion compared to $1.6 billion in the first quarter of 2023, driven by higher spend on upgrade rebuild, primarily network evolution and higher CPE spend due to purchases of Xumo Stream boxes. For the full-year 2024, we continue to expect capital expenditures to total between $12.2 billion and $12.4 billion, including line extension spend of approximately $4.5 billion and network evolution spend of approximately $1.6 billion.
Turning to free-cash flow on slide 10. Free cash flow in the first quarter totaled $358 million, a decrease of approximately $300 million compared to last year. The decline was primarily driven by an increase in capital expenditures and a onetime settlement payment in the first quarter of 2024, partly offset by a less unfavorable change in working capital year-over-year and higher adjusted EBITDA.
We finished the quarter with $97.8 billion in debt principal. Our current run rate annualized cash interest is $5.2 billion. Given our long dated and 85% fixed-rate debt structure, our sensitivity to higher rates is relatively low. If we refinanced all of our debt due in 2025 and 2026 at current rates, the impact to our run rate interest expense would be less than $140 million. As of the end of the first quarter, our ratio of net debt to last 12-month adjusted EBITDA was 4.41 times, which is lower sequentially and year-over-year.
We expect to continue that trend, moving closer to the middle of our 4 times to 4.5 times target leverage range through the end of this year. We remain fully committed to maintaining our split rated debt structure, including access to the investment-grade market given the significant benefits it offers to all of our providers of capital. And we continue to be confident in the long term trajectory of the business. We believe that our levered equity strategy, including share buybacks, combined with the investments that we are making in the business will drive value going forward.
During the quarter, we repurchased 1.7 million Charter shares and Charter Holdings common units, totaling $567 million, at an average price of $339 per share. With the continued temporary impact from cell phone Internet competition and the potential headwind from the end of ACP, we will continue to face short-term customer growth headwinds. Despite these short-term challenges, we are competing well. We have a very attractively structured balance sheet and we're focused on driving healthy EBITDA growth in 2024 through a short-term competitive and investment cycle. So we're well positioned today and for continued future growth.
With that, I'll turn it over to the operator for Q&A.