Mike Sievert
President and Chief Executive Officer at T-Mobile US
Okay. Thanks, Cathy. Hi, everybody. Welcome to the Q3 call. We're coming to you from Bellevue today, and I'm joined by several members of our senior leadership team to talk about another outstanding quarter for T-Mobile. Now given our recent Capital Markets Day, Peter and I are going to keep our remarks pretty light so that we can get right to your questions and before I get into our quarter, I do want to take a moment to recognize our team for their hard work around-the-clock to help our customers, fellow employees and communities to get back on their feet in the wake of Hurricanes Helene and Milton. It was devastating to have back-to-back storms of this scale form in such rapid succession, but I am so proud of how our team showed up from readiness to recovery, their tireless efforts and use of innovative technologies made a huge difference in affected communities.
Okay. Turning to the quarter. In short, it was a really strong one. In fact, Q3 is an example of the consistent execution we talked about a few weeks ago as a core enabler of our bold multiyear plan. As you know, achieving that plan is predicated on delivering strong results reliably and repeatedly to keep pace with our ambition and we did just that in Q3, empowering us to raise our 2024 guidance yet again. I'll start with our mobile business. We delivered the best Q3 postpaid phone net adds in a decade, fueled by record low Q3 postpaid phone churn and continued year-over-year growth in gross adds.
We also continued to lead the industry in share of switchers and we grew share of households in both top 100 and smaller markets in rural areas. Our powerful combination of our best network, best value, and best customer experience continues to be a winning formula. We believe we have lots of room to run in our underpenetrated areas and segments, including among those who shop primarily on network attributes all across this country. Now you heard us lay down some pretty audacious digitalization goals at our Capital Markets Day event and we're making steady progress.
I'm proud to share that our total digital mix of iPhone launch sales in Q3 is up 40% just year-over-year and that for the first time, the majority of T-Mobile branded iPhone pre-orders this year were digital. This highlights the early progress we've already begun to make in further simplifying and digitalizing and transforming the customer buying experience. And it validates the appetite our customers have for buying online, when they are given the option for a more seamless process. Our customer momentum also continues in broadband, where we delivered industry-leading net-adds once again and reached a major milestone of 6 million customers in just three years.
We're now halfway to our long-term target of 12 million customers by 2028. Our performance is fueled by our leading 5G network, which was recently awarded once again as having the best 5G availability in the world by open signal. And our industry-leading technology will continue to further differentiate us as more and more new handsets come into the marketplace that can take advantage of our new technologies like voice over new radio, our incredible four-way carrier aggregation technology and so many other things. Across the board, our team is doing awesome work to further extend our 5G network leadership for the benefit of customers and they're noticing the superior speed, capacity and consistency relative to our competition.
Okay. Moving on to our financials. In Q3, we once again demonstrated our ability to deliver profitable customer growth, which we translated to industry-leading service revenue growth, including year-over-year postpaid service revenue growth about 2x that of peers, driven by our highest ARPA growth in seven years as we continue to deepen customer relationships. Our core adjusted EBITDA growth of 9% led the industry by a wide margin. That combined with our unparalleled capital efficiency led once again to industry-leading free-cash flow conversion.
I said I'd keep it brief. So let me sum it up. Our formula for generating outsized value-creation from focusing on smart and profitable growth continues to work really well. We have lots of runway ahead of us to continue to deliver profitable industry-leading growth as we drive forward on the ambitious plan we shared with you last month. Okay. Peter, over to you to provide an update on our guidance, please.