Jessica Fischer
Chief Financial Officer at Charter Communications
Thanks guys. Before discussing our first-quarter results. I want to remind everyone that starting this quarter, we've made some changes to the way we report our P&L. First, we now include mobile service revenue in the residential and SMB revenue as appropriate and mobile equipment revenue is now reported in other revenue.
On the expense side, we no longer report mobile expenses separately and those are now included in the applicable expense category. Ultimately, these changes better reflect the converged and integrated nature of our mobile business and our operations and offer structure. For additional information regarding these changes, please review Footnote A on page seven of the trending schedule we posted this morning.
Now, let's turn to our customer results on slide five. Including residential and SMB, we added 76,000 internet customers in the first quarter. Video customers declined by 241,000, partly driven by a programming expense increase passed through in January of this year.
Wireline voice declined by 220,000, and we added a record 686,000 mobile lines. Although our internet customer growth continued to be positive in the first quarter, market activity levels remained low. During the quarter, total churn was slightly higher than last year but still near-record lows and well below pre-pandemic levels.
We've seen a small impact from fixed wireless across -- fixed wireless access competitors in the price-sensitive customer segment. Generally speaking, however, these customers typically exhibit higher levels of churn regardless of competition. And given the issues with fixed wireless product speeds, as confirmed by third parties, and questions surrounding that product's reliability and scalability, we expect fixed wireless customers to find their way back to us over time.
We continue to drive very strong mobile growth with our high-quality, differentiated and attractively-priced service. The majority of new lines continue to come from existing internet customers though the percentage of lines coming from acquisition has increased significantly since the introduction of our Spectrum One product. And as we mentioned last quarter, our converged customers have meaningfully lower internet and customer relationship churn.
As Chris mentioned, we also continue to perform well in rural areas. The new rural disclosures we issued today on page five of our trending schedule show that we continue to see robust growth in rural passings. During the quarter, we activated 44,000 subsidized rural passings despite winter's construction seasonality.
Penetration of subsidized rural passings continues to exceed our original target. And these rural customers are purchasing products beyond internet, including mobile, video and wireline voice.
Moving to financial results starting on slide six, over the last year, residential customers were down slightly with new customer growth driven by internet, offset by video-only customer churn. Residential revenue per customer relationship grew by 2.5%, with promotional rate step-ups, rate adjustments and the accelerated growth of Spectrum Mobile, partly offset by a higher mix of non-video customers and growth of lower-priced video packages within our base.
As slide six shows, residential revenue grew by 2.5% year-over-year. And as a reminder, starting this quarter, our residential revenue now includes mobile service revenue, which grew from $387 million in the first quarter of 2022 to $497 million in the first quarter of 2023.
Turning to commercial, SMB revenue grew by 2% year-over-year, reflecting SMB customer growth of 2.4%. Enterprise revenue was up by 3.1% year-over-year. Enterprise PSUs grew by 4.9% year-over-year. And excluding all wholesale revenue, enterprise revenue grew by 7.3%.
First quarter advertising revenue declined by 7.2% year-over-year due to less political revenue. Core ad revenue was down 2.1% year-over-year, driven by lower local and national advertising revenue, offset by our growing advanced advertising capabilities. Other revenue grew by 34% year-over-year, primarily driven by higher mobile device sales and higher rural subsidies. In total, consolidated first quarter revenue was up 3.4% year-over-year.
Looking to second quarter revenue growth, I would remind you that we will lap April 2022 rate adjustments and face the headwind of strong political advertising revenue in the prior year.
Moving to operating expenses and EBITDA on slide seven, in the first quarter, total operating expenses grew by $316 million or 3.9% year-over-year. Programming costs declined by 6% year-over-year due to decline in video customers of 5.2% year-over-year and a higher mix of lighter video packages, partly offset by higher programming rates.
Note that our first quarter programming costs included $50 million of favorable adjustments, which is similar in size to sports network rebates and other favorable adjustments we saw in the first quarter last year.
Looking at the full-year 2023, we continue to expect programming cost per video customer to be approximately flat year-over-year. Other cost of revenue increased by 19.9%, primarily driven by higher mobile device sales and other mobile direct costs.
Constant service customers increased by 6.9% year-over-year, driven by adjustments to job structure, pay and benefits to build a more skilled and longer-tenured workforce, resulting in lower front-line employee attrition compared to 2020 and additional activity to support the accelerated growth of Spectrum Mobile.
Partly offset by productivity improvements as a result of the programs we discussed at our December Investor meeting, our employee attrition declined more quickly than we had expected, which is allowing us to lower our normal hiring in the first half of this year and increase overall tenure and quality. Longer-term, we continue to expect additional efficiencies and cost to service customers over-time as a result of our continuing lower service transactions, service tenure and digital service investments, proactive maintenance and network evolution investments.
Sales and marketing costs grew by 7.6%, primarily driven by higher staffing across sales channels and the accelerated growth of Spectrum Mobile. And other expenses grew by 6.7%, driven by higher labor costs. Adjusted EBITDA grew 2.6% year-over-year in the quarter.
Turning to net income on slide eight, we generated $1 billion of net income attributable to Charter shareholders in the first quarter, down from $1.2 billion last year, with higher adjusted EBITDA more than offset by higher interest expense.
Turning to slide nine, capital expenditures totaled $2.5 billion in the first quarter, above last year's first quarter spend of $1.9 billion. The increase was primarily driven by higher spend on line extensions, which totaled $890 million in the first quarter of 2023 compared to $541 million in the prior quarter, driven by Charter's subsidized rural construction initiatives and continued network expansion across residential and commercial greenfield and market fill-in opportunity.
I would also note that in the first quarter, we saw a sequential decline in total capex associated with our subsidized rural construction initiatives, as we purchased a significant amount of rural construction equipment inventory as supply chain issues improved in the fourth quarter.
First quarter capital expenditures, excluding line extensions, totaled $1.6 billion compared to $1.3 billion in the first quarter of 2022.,We spent more on upgrade rebuild, given our network evolution initiatives. Customer premise equipment which includes installation costs was higher year-over-year, and support capital was also up, just given timing.
Our expectations for full-year 2023 capital expenditures have not changed, in part because the costs associated with our network evolution and rural construction initiatives are coming in as planned.
For the full year, we continue to expect capital expenditures excluding line extensions to be between $6.5 billion and $6.8 billion. Following the expected completion of our network evolution initiative at the end of 2025 or the beginning of 2026, capex excluding line extensions as a percentage of revenue should decline to below 2022 levels and continue to decline thereafter. And we expect 2023 line extension and capital expenditures to reach approximately $4 billion.
We continue to expect 2024 and 1,025 line extension capex to look similar to our outlook for 2023 at approximately $4 billion per year. And our 2024 and 2025 line extension capital expenditure expectations assume that we win funding for or otherwise commit to additional overall spending.
As slide 10 shows, we generated $664 million of consolidated free cash flow this quarter versus $1.8 billion in the first quarter of last year. The decline was primarily driven by higher capex, mostly driven by our network expansion and network evolution initiatives, and an unfavorable change in working capital, excluding the impact of mobile devices, which was typical seasonality for our first quarter but larger than last year.
The year-over-year headwind was partly driven by outgoing payments related to the larger inventory buildup in Q4 of 2022 that I just mentioned. For the full year, however, we expect the change in working capital, excluding the impact of mobile devices, to be roughly neutral, as our capital and payroll accruals should rise over the course of the year. Mobile device working capital will remain a headwind, given the mismatch in timing between when we receive EIP payments and when we pay handset providers.
Also in the first quarter, we didn't make significant cash tax payments. And generally speaking, we make four federal cash tax payments a year, with two quarterly payments made in the second quarter and one payment made in each of the third and fourth quarters. We're not changing our cash tax outlook that we provided on last quarter's call and simply providing a bit more clarity on the timing of cash tax payments.
We finished the quarter with $97.8 billion in debt principal. Our current run rate annualized cash interest is $5.1 billion. As of the end of the first quarter, our ratio of net debt to last 12 month adjusted EBITDA was 4.47 times. And we intend to stay at or just below the high end of our 4 times to 4.5 times target leverage range.
During the quarter, we repurchased 2.6 million Charter shares and Charter Holdings common units, totaling about $1 billion at an average price of $375 per share. Charter's bandwidth rich 2a network passes nearly 56 million homes and businesses, with gigabit and converged services everywhere. And given the significant investments we've made in that network over a multiyear period, we are now in a position to upgrade it further in both the cost-efficient and time efficient manager -- manner to offer the fastest speeds and the most advanced telecommunication services in the country.
Additionally, our scale and our capabilities are allowing us to rapidly expand that network, both to unserved and underserved areas, through our rural construction initiatives and two other high ROI expansion opportunities. Those initiatives combined with our service-oriented operating strategy and prudent capital allocation are poised to drive long-term customer growth, higher free cash flow and shareholder value.
Operator, we're now ready for Q&A.