AT&T and Boldyn Networks bring cellular service to the MTA's Joralemon Street tunnel, with expanded G line connectivity next

AT&T is bringing 5G cellular connectivity to millions of New Yorkers, delivering faster service and better digital access for subway riders

NEW YORK, Oct. 7, 2025 /PRNewswire/ -- AT&T, in collaboration with Boldyn Networks (Boldyn), expanded cellular connectivity in New York City's Joralemon Street tunnel, with crosstown G line segments next, providing early momentum for what will be one of the most important wireless upgrades to Brooklyn's transit system in years. Connectivity is live on-air for AT&T riders in the Joralemon Street tunnel, with connectivity on the G line to follow.

The Joralemon Street tunnel is the oldest underwater subway tunnel in New York City, and its 1.1-mile stretch connects the 4 and 5 lines between Manhattan and Brooklyn. In addition, the crosstown G runs through some of the most popular and vibrant places in Brooklyn and Queens, providing a critical connection to Manhattan bound trains. With this commitment, 4/5 train riders (between Borough Hall station in Brooklyn to Bowling Green station in Manhattan) and G train riders (between Court Square station in Queens to Hoyt-Schermerhorn Streets station in Brooklyn), will begin to experience mobile service connectivity in tunnel segments.

The Joralemon Street tunnel and G line mark the next major step in Boldyn and the MTA's work to expand 5G and enhance connectivity throughout the New York City subway system. AT&T will be the first carrier providing wireless connectivity to its users in these tunnels, sending a strong signal to riders that universal subway connectivity is on the way.

"Reliable connectivity is foundational to New York City's infrastructure and quality of life," said John Emra, President, Atlantic Region, AT&T. "This investment reflects our long-standing commitment to the city, bringing secure, dependable mobile service to the heart of the subway system and supporting the infrastructure that keeps New Yorkers connected, productive, and moving."

"We're committed to using technology to improve the customer experience, and our customers deserve connectivity in the system. We're proud to expand service with this partnership at no cost to our riders," said Jamie Torres-Springer, President, MTA Construction & Development. "We're thrilled with AT&T's engagement, and we expect other carriers will see the benefits of this partnership and help us push this movement forward."

"We're gratified to play a major role in bringing reliable, secure wireless service to New Yorkers. With this overall expansion project, we will bring uninterrupted cellular coverage across 418 miles of MTA's network, which is a uniquely complex environment because of 24/7 service, high volume wireless usage, and subterranean infrastructure," said Christos Karmis, CEO of Boldyn Networks, US. "AT&T's early commitment to joining this important work sets the pace for what's to come across the subway system."

"We're excited to bring 5G connectivity to more New Yorkers, and proud to be the first to step up on the Joralemon Street tunnel and G line," said Cameron Dunn, AVP – In-Building Solutions, AT&T. "Our customers depend on a reliable network whether they're above ground or on the move underground. Our continuing investment in the New York City Subway's wireless network reflects our commitment to delivering just that."

Transit advocates have long called for more reliable service underground, and today's announcement signals meaningful progress for Brooklyn riders in particular.

"New York subway riders expect and are increasingly expected to stay connected to our family members, friends and colleagues during our commutes. Expanding 5G service to #4 and #5 trains in the Joralemon Street tunnel and along the G line is a win for New Yorkers, especially Brooklyn riders who have long called for better underground connectivity. This progress brings us closer to a subway system that truly serves riders' 21st-century evolving needs," said Betsy Plum, Executive Director, Riders Alliance.

Boldyn's overall project to wire the entire subway system is well underway, with a phased rollout that includes previously unconnected lines. Currently, mobile carrier customers can enjoy cellular service in underground tunnels on the 42nd St Shuttle line and a L line segment between Bedford Avenue station in Brooklyn and 1st Avenue station in Manhattan. Cellular and Wi-Fi connectivity are also available in all underground subway stations.

About Boldyn Networks
Boldyn Networks is one of the world's largest neutral host providers and a leader in private networks, delivering the advanced shared network infrastructure needed for a smart, inclusive, and sustainable future. It brings together the combined scale and expertise of industry-leading companies with a single purpose: to unlock the power of an interconnected future. From interconnected transit, venues and enterprises, smart cities, next-generation and bespoke private networks, to smart campuses, Boldyn enables new possibilities in the way people live, work and play. Bringing connectivity to the most complex environments. Our portfolio is harnessing fiber, accelerating 5G, and looking beyond to the next breakthroughs. With headquarters in the UK, Our global operations span North America, Europe, and Asia. Boldyn Networks. Reimagine tomorrow. Transform today.
Learn more at: www.boldyn.com 

For more information contact
Neg Kiaee
Sr. Director, Marketings & Communications
Boldyn Networks
E [email protected] 

SOURCE Boldyn Networks