Carrier data is information that identifies the telephone or broadband network connecting a device to the internet. It reaches advertisers in two forms: as a field attached to an ad request, and as audience information that a network operator builds from its own traffic and licenses. A request describes a page, an app and a device, yet says little verifiable about the connection; the operator is one of the few parties able to supply it.

The first form is routine. Inside the bid request, a few fields in the device object name the mobile network operator or internet service provider (ISP) serving the user. PPC Land's explainer on the bidstream lists carrier among the attributes the device object carries, beside make, model, IP address and the mobile advertising identifier. The second form is a product: segments, scores or identifiers assembled by telecommunications groups.

How the signal reaches a bidder

An auction begins when an app or page asks for an ad. The supply-side platform (SSP) or exchange assembles an OpenRTB request - OpenRTB being the real-time bidding protocol maintained by IAB Tech Lab - and sends it to bidders. In version 2.6 the device object defines carrier as a string for the "carrier or ISP", with VERIZON as the example, drawn from names the exchange curates and is expected to publish to bidders beforehand. Two exchanges may therefore spell the same operator differently.

A second field, mccmnc, is numeric. It joins a three-digit mobile country code (MCC) and a two- or three-digit mobile network code (MNC) with a mandatory dash; the specification's example, 310-005, identifies Verizon Wireless CDMA in the United States. The International Telecommunication Union assigns the codes under recommendation E.212. According to the OpenRTB text, the value reflects the SIM card, not the network in use, so a roaming handset keeps its home code and roaming has to be inferred from the code, the location and the IP address together. AdCOM, the companion specification of shared objects, adds mccmncsim and says a difference between the two values reveals roaming, yet it still describes mccmnc in SIM terms, leaving the intended split unclear.

Connection type completes the set. It is an integer from an AdCOM list: 0 for unknown, 1 for Ethernet, 2 for Wi-Fi, 3 for cellular of unknown generation, and 4 to 7 for 2G, 3G, 4G and 5G.

The values originate on the device. According to Android documentation, the TelephonyManager class returns the MCC and MNC of the registered operator and, separately, those of the SIM provider; an advertising software development kit (SDK) inside an app can read both. On iPhones that route has narrowed: Apple deprecated its CTCarrier class in iOS 16, and the iOS 16.4 release notes state that it returns static values for apps built with that SDK or later. A browser has no equivalent call, so a web request can only carry an operator name inferred elsewhere, most plausibly from the IP address.

On the buy side, demand-side platforms (DSPs) and ad servers turn the fields into targeting. Google Ad Manager lets publishers target carriers such as AT&T, Verizon or T-Mobile, and its API reference notes that this is available only to mobile publishers. Reddit introduced carrier targeting on February 4, 2022, in the US, the UK and Canada. In reporting, DV360 aligned its identifiers for ISP or carrier with cross-platform standards in a Data Transfer v2.0 change implemented on July 7, 2025.

The operator-owned version

Jess Zhu, head of advertising products at T-Mobile Advertising Solutions, explained that any internet-connected app needs the carrier's network and that T-Mobile examines those requests to infer app usage and build audiences. On October 5, 2026, Vistar Media, T-Mobile's out-of-home unit, announced thousands of audience segments built on that data, sold only through Vistar's own DSP. T-Mobile converts its signals into aggregated scores of where an audience is likely to be, and Vistar matches them to screens. The buy works at the level of place and time, not the individual.

Europe took a different route. Utiq, a Brussels-based company founded in 2023 by Deutsche Telekom, Orange, Telefonica and Vodafone, converts network signals into pseudonymous identifiers only after a user consents. According to Utiq's documentation, its SDK makes a secure call to the user's operator, the operator returns a network signal, and Utiq maps it to a random value called a consentpass. As of November 15, 2025, Utiq reported 70 million users across six markets. Its identifiers work in Safari and Firefox, and from September 28, 2025 reached HbbTV and connected television in Germany.

Origin and evolution

OpenRTB began as a pilot in November 2010. A mobile specification followed in February 2011, a unified version 2.0 in June 2011, and version 2.1 became an IAB Tech Lab standard in January 2012. Version 2.6, which PPC Land's explainer on addressable reach dates to April 2022, moved enumerated lists into AdCOM, whose first version carries a March 2022 date. Since version 2.6-202211 the specification has been updated roughly monthly.

Regulators looked at operator data early. According to the Federal Communications Commission (FCC), Verizon began inserting a unique identifier header into customers' mobile web traffic in December 2012 and disclosed it in October 2014. Verizon settled on March 7, 2016, paying $1.35 million. A larger case followed 2018 reports that carriers sold real-time location data through aggregators. On April 29, 2024, the FCC fined Sprint, T-Mobile, AT&T and Verizon close to $200 million in all for sharing access to location data without valid consent. On June 4, 2026, the Supreme Court held 8-1 in FCC v. AT&T that the commission's forfeiture orders do not violate the Seventh Amendment.

Commercial consolidation came in 2025. T-Mobile announced a $600 million purchase of Vistar Media on January 13, 2025 and completed it on February 3. It then bought the location data company Blis for about $175 million, a deal that closed on March 3. T-Mobile's annual report records $174 million.

Why it matters for the marketing community

Advertising identifiers have grown less dependable, and a network signal sits beneath both the browser and the operating system. Operators also hold consent relationships that PPC Land's coverage of the Utiq deal described as reaching hundreds of millions of Europeans. For digital out-of-home buying, a carrier-derived score offers location and app-use signals without an advertising ID. For measurement, the fields allow results to be split by operator or roaming traffic flagged, within the limits below.

Limitations and open disputes

The bid request fields are coarse. An operator name or MCC-MNC pair identifies a network, not a person, and mobile virtual network operators (MVNOs) without codes of their own share those of their host. Naming varies by exchange, the iPhone value has been a placeholder since iOS 16.4, and roaming can only be inferred. Where operators are inferred from IP addresses, accuracy is contested. Truthset research from November 5, 2025 found IP-to-postal linkages accurate 13 per cent of the time, tested against records from two ISPs and one video distributor. Those studies test household matching, not operator names, so their bearing on the carrier field is indirect.

Operator-held data has drawn the heaviest enforcement in the field. The FCC's 2024 fines concerned sales of real-time location data to aggregators that resold it and the carriers contested them until the Supreme Court ruled. The decision settled how such penalties may be imposed, not whether the practices were acceptable.

Consent is the second dispute. Utiq says it cannot identify the user from the network signal. A Captain Compliance analysis asks whether the model is a privacy advance or a privacy Trojan horse. Vistar's announcement calls T-Mobile's segments consented, but as PPC Land noted, it does not describe the consent mechanism, the size of the consented base or the refresh frequency of the scores. Vitalii Morozenko, chief executive of the Ukrainian platform myGaru, said "there is no telecom in the world that succeeded with this", yet AdExchanger reported that Kyivstar's addressable reach rose from 35 per cent to 97 per cent after integration.

A structural dispute follows from T-Mobile's exclusivity. Zhu attributed it to tightening regulation of location data. PPC Land's analysis argued that the rule does not reduce the data in circulation but concentrates it in companies large enough to own both network and DSP.

Not the same as

Connection type. The field describing the technology in use - Ethernet, Wi-Fi, or 2G to 5G - not the operator. A phone on Wi-Fi still reports its SIM's operator code.

Telco identity. Identifiers such as Utiq's are derived from operator signals and sold as IDs. The carrier field only names a network. PPC Land's coverage of FreeCast notes that Utiq's system excludes data onboarding and identity graphs.

Shipping carrier. In Google Merchant Center, the carrier_shipping attribute carries parcel delivery prices and transit times, nothing to do with telecommunications.

Device manufacturer. The make and model fields in the same object identify hardware. PPC Land's explainer on OEMs notes that operators also preload apps and sign revenue share deals but do not build the hardware.

Recent developments

The Trade Desk and Utiq announced their EMEA partnership on June 1, 2026. On July 7, 2026, ten European media, data and telecom companies launched the European Media Marketplace on Equativ infrastructure, with Deutsche Telekom's advertising arm, Orange Advertising, Vodafone and Virgin Media O2 among the founding members. The latest step came on October 5, 2026, when T-Mobile's carrier segments went on sale through Vistar alone,, according to PPC Land's reporting.

Timeline

  • November 2010: OpenRTB begins as a pilot among three demand-side and three sell-side platforms
  • February 2011: OpenRTB Mobile 1.0 is released
  • June 2011: OpenRTB 2.0 unifies display, mobile and video
  • January 2012: IAB Tech Lab adopts OpenRTB 2.1 as a standard
  • December 2012: Verizon begins inserting unique identifier headers into mobile traffic, according to the FCC
  • October 2014: Verizon discloses the practice
  • March 7, 2016: Verizon settles with the FCC for $1.35 million
  • 2018: Public reports emerge that carriers sold real-time location data via aggregators
  • February 4, 2022: Reddit Ads adds carrier targeting in the US, UK and Canada
  • March 2022: AdCOM 1.0 is published
  • April 2022: OpenRTB 2.6 is published
  • 2023: Utiq is founded by Deutsche Telekom, Orange, Telefonica and Vodafone
  • 2023: Apple's CTCarrier class begins returning static values for apps built with the iOS 16.4 SDK
  • April 29, 2024: FCC fines AT&T, Sprint, T-Mobile and Verizon nearly $200 million
  • January 13, 2025: T-Mobile announces the $600 million Vistar Media acquisition
  • February 3, 2025: The Vistar deal completes
  • March 3, 2025: T-Mobile closes the Blis acquisition
  • July 7, 2025: DV360 Data Transfer v2.0 changes identifiers for ISP or carrier
  • September 28, 2025: Utiq and Visoon launch consent-based identifiers for HbbTV and connected TV
  • November 15, 2025: Utiq reports 70 million users across six markets
  • June 1, 2026: The Trade Desk and Utiq announce an EMEA partnership
  • June 4, 2026: The Supreme Court rules 8-1 in FCC v. AT&T
  • July 7, 2026: The European Media Marketplace launches on Equativ infrastructure
  • October 5, 2026: Vistar announces T-Mobile carrier segments, sold only through its DSP

Summary

Who. Mobile network operators and ISPs generate the underlying signal; SSPs and exchanges place it in bid requests; DSPs, ad servers and social platforms use it for targeting; operator advertising units such as T-Mobile Advertising Solutions and Utiq's four founding operators sell derived audiences and identifiers; the FCC and European data protection regimes police it.

What. Information identifying the network that connects a device, carried in OpenRTB fields such as carrier, mccmnc and connection type, and sold in derived form as audience segments, scores and consent-based identifiers.

When. The fields date from the early OpenRTB mobile specifications of 2011, enforcement began with the Verizon settlement in 2016 and the FCC fines of 2024, and the commercial push by operators accelerated from 2023 and through 2025 and 2026.

Where. In the device object of every OpenRTB request, in Android and iOS device interfaces, in DSP and ad server targeting menus, and in operator-run platforms such as Vistar and Utiq.

Why. It gives buyers a network-level fact that app, browser and exchange cannot easily verify, and gives operators a way to monetise subscriber relationships as advertising identifiers weaken, at the cost of coarse signals, uneven iOS availability and unresolved consent questions.