What the scores measure

Aggregated audience scores are figures attached to places rather than people. In digital out-of-home (DOOH) advertising, a data provider tallies which kinds of mobile devices appear near a screen, group by group, then reduces the tally to one number per screen, often per hour of the week, showing how strongly a chosen audience is concentrated there compared with the wider population. Buyers then bid on the highest-ranked screens. The method exists because an outdoor panel has no cookie, no login and no click. It cannot know who is watching, so the score estimates who tends to be nearby at a given hour.

The phrase appears in other fields too, for instance in review sites that average viewer ratings. That meaning is unrelated. The advertising sense returned to the agenda on October 5, 2026, when Vistar Media opened thousands of T-Mobile carrier-data segments to screen advertisers, with the carrier converting its signals into scores that Vistar matches to inventory.

How a score is built and used

Five steps recur across vendors. Segment membership comes first: a data owner labels devices, say as owners of streaming apps or frequent travellers. Movement data follows, showing where those devices turn up. Third, the provider draws a catchment around each screen; the method Adsquare uses, as documented by the DOOH buying platform Displayce, collects mobile data within 60 metres of each asset. Fourth, an index is computed for each segment, screen and time slot from four counts: target-group users seen at the location, all users seen there, all target-group users and all users. Displayce says the figure runs from 0 to N. Fifth, the buying platform ranks screens by score and trades against the list. According to the announcement of the Displayce partnership, the calculation is refreshed for every hour of the week.

A constructed example, drawn from that description rather than from any vendor, shows the arithmetic. If 12 percent of devices seen near a mall screen on Saturday afternoons belong to a segment that makes up 6 percent of all devices in the panel, the index is 2.0. A value of 1.0 signals no concentration; anything lower signals under-representation.

The T-Mobile route compresses the same logic into two stages. According to Vistar's press release, T-Mobile Advertising Solutions converts carrier signals into aggregated scores and Vistar matches them to inventory. According to AdExchanger, Jess Zhu, head of advertising products and development at T-Mobile Advertising Solutions, said the carrier can read network requests to see which apps a device uses and how often, and, where a user has opted into location tracking, whether the device came near an out-of-home ad. A regular user of a pet-delivery app and a cat game could be placed in a "cat lovers" audience, she said.

The score acts before the auction. In a Meetic campaign described by Adsquare, a custom dataset of well-scored screens was activated through a pre-bid integration with Displayce. The bid request carries different information. Since November 2022, OpenRTB has included a dooh object describing the venue and a qty object whose multiplier states how many impressions a single play counts as; the in-store explainer covers the fields. The score therefore decides which screens a buyer wants, while the multiplier decides what one play is worth.

On the sell side, media owners and supply-side platforms such as VIOOH, Vistar and Place Exchange connect screens to automated demand; on the buy side, demand-side platforms including Vistar's own, Displayce and The Trade Desk let agencies bid. Data owners sit alongside both: carriers, location specialists and panel providers.

Origins and evolution

Clear Channel Outdoor Americas debuted RADAR on February 29, 2016, overlaying mobile data from AT&T Data Patterns, Placed and PlaceIQ on its US inventory, an early planning layer built on the same idea. Screen-level scoring for programmatic buying appears in PPC Land coverage on September 30, 2020, when Adsquare partnered with Vistar Mediato score each screen by the ratio of target-group users to all users seen nearby, starting in the UK. The concept may predate that announcement. Displayce followed on June 27, 2022 with a self-service integration offering more than 1,000 segments, and Yahoo's DSP added Adsquare "Audience Scores" for EMEA in 2022, according to Adsquare.

Standards trailed the commerce. The OpenOOH Venue Taxonomy first published in 2020. In July 2021 the OAAA issued guidelines on capturing mobile advertising identifiers to evaluate DOOH exposure. OpenRTB gained its DOOH support in November 2022.

Ownership then consolidated. T-Mobile agreed to buy Vistar Media for $600 million on January 13, 2025, completed the deal on February 3, and bought the location specialist Blis in March. On May 6, 2025, at IAB NewFronts, T-Mobile said its first-party data was available within the Vistar platform. Distribution of rival scoring widened as well: The Trade Desk added Adsquare data to Audience Unlimited on June 17, 2026, and Amazon DSP listed Adsquare segments about five weeks later.

Why it matters for marketers

Out-of-home is the large channel with no identifier to lean on. The OAAA put US revenue at a record $9.46 billion in 2025, according to the DeepIntent coverage. When T-Mobile agreed to buy Vistar, the company described a network of more than 1.1 million screens, nearly 370 media owners and over 3,000 brand advertisers. Without scores, planners buy whole cities or venue types. With them, selection can drop to the individual panel, the direction taken by A8 Media's Signal, released on September 9, 2026.

Hannah Grobmyer, vice president of client solutions at the agency Kepler, told AdExchanger that stronger data fidelity could give clients the confidence to scale programmatic OOH buying and to look beyond premium screens that usually require direct deals.

Limitations and disputes

Opacity. The October announcement gives no pricing, no list of markets and no campaign results, and it does not describe the size of the consented base, the consent mechanism or how often scores refresh, as PPC Land noted in its report.

Concentration is not volume. An index of 2.0 on a quiet side street can mean few people. Adsquare's planning page lists concentration, reach and index as separate outputs, and Displayce's Meetic work balanced concentration against reach.

Panels, not censuses. An Adsquare interview with Mercury Media Technology said its OOH and footfall tools rest on a panel-based approach with statistically relevant samples. By construction, people without a participating device are absent.

Standards. The Media Rating Council published combined out-of-home standards on December 4, 2025. Phase 1 in April 2024 omitted audience; Phase 2 draft requirements opened for comment on July 28, 2025 and call for evidence of likelihood to see, while the final thresholds set a minimum of 1.5 percent of the field of view and a maximum angle of 55 degrees per axis. None of the announcements reviewed cites accreditation of a scoring method, and a score targets audience rather than counting it.

Privacy and law. Zhu told AdExchanger that tightening rules on location data and device identifiers explain why T-Mobile did not share the data with any third-party platform. The European Data Protection Board adopted Guidelines 02/2026 on July 7, 2026, with comment open until October 30, 2026; the three-part framework adds a no-inference criterion, and PPC Land has noted that aggregated audience segments sit inside the territory it addresses. In the United States, the FTC closed its Kochava case on May 4, 2026 with an order restricting sales of sensitive location data, and Virginia signed SB 338 on April 13, 2026, banning sales of precise geolocation within 1,750 feet from July 1, the third state after Oregon and Maryland. The sources reviewed do not say whether a derived, aggregated score counts as such a sale.

Exclusivity. T-Mobile's segments run only through the Vistar DSP, whereas Adsquare's scoring is spread across several platforms. Sources also differ on novelty: T-Mobile said in May 2025 that its data was already in the Vistar platform, yet the October 2026 release speaks of enhanced segments and AdExchanger reports tests since 2025.

Not the same as

Audience segment. A segment is a group of devices or people. A score describes a screen and a time slot, and says how heavily that group shows up there.

Impression multiplier. The multiplier converts one ad play into a number of impressions. IAB Australia's guide, covered in PPC Land's report, gives the formula as audience impressions divided by ad plays. It measures volume; a score measures concentration.

Propensity score. A propensity score attaches a probability, such as purchase or churn, to an individual; IAB Italia's white paper places such models under predictive targeting and scoring. A screen score attaches to a place.

Footfall attribution. Footfall attribution matches exposure to later visits. Scoring operates before delivery; attribution after it.

Recent developments

Beyond the October 5 release, Zhu told AdExchanger that T-Mobile has no DOOH measurement product today and that "that is on our road map to look into for next year". She described agentic AI tools for building custom audiences as prototypes, with wider availability expected in the first half of 2027. Vistar inventory also reached a third-party DSP on August 18, 2026, when DeepIntent added it, though the new T-Mobile segments are not part of that arrangement. On the verification side, Big Happy became the first Veridooh partner to sell US DOOH on a verified CPM in August 2026, charging only for validated plays. Whether scores will ever be audited to the same standard as plays remains open.

Timeline

  • February 29, 2016: Clear Channel Outdoor Americas debuts RADAR, overlaying mobile data on its US inventory.
  • 2020: The OpenOOH Venue Taxonomy publishes its first version.
  • September 30, 2020: Adsquare and Vistar Media partner to score DOOH screens, starting in the UK.
  • July 2021: The OAAA releases guidelines on capturing mobile advertising identifiers to evaluate DOOH exposure.
  • June 27, 2022: Adsquare partners with Displayce, offering more than 1,000 segments with hourly index recalculation.
  • November 2022: IAB Tech Lab adds the dooh and qty objects to OpenRTB.
  • April 2024: The MRC publishes Phase 1 out-of-home standards, excluding audience.
  • January 13, 2025: T-Mobile announces its $600 million acquisition of Vistar Media.
  • February 3, 2025: The Vistar deal completes.
  • May 6, 2025: T-Mobile says its first-party data is available within the Vistar platform.
  • July 28, 2025: The MRC opens Phase 2 audience standards for public comment.
  • August 21, 2025: IAB Australia publishes its programmatic DOOH buyers guide.
  • December 4, 2025: The MRC publishes combined Phase 1 and 2 out-of-home standards.
  • June 17, 2026: The Trade Desk integrates Adsquare into Audience Unlimited.
  • July 7, 2026: The EDPB adopts Guidelines 02/2026 on anonymisation.
  • October 5, 2026: Vistar announces enhanced T-Mobile audience segments, available exclusively through its DSP.
  • October 30, 2026: Comment closes on the EDPB anonymisation guidelines.

Summary

  • Who: Data owners such as T-Mobile Advertising Solutions and Adsquare, platforms such as Vistar Media and Displayce, media owners, and agencies and brands buying screens.
  • What: Per-screen, often per-hour figures showing how strongly a chosen audience is concentrated near a screen compared with the average, used to rank inventory for programmatic DOOH buying.
  • When: In use since at least September 30, 2020; most recently extended by Vistar's October 5, 2026 announcement of T-Mobile carrier-data segments.
  • Where: Digital screens in public and semi-public venues, bought through DSPs and supply-side platforms using OpenRTB; the October 2026 release names no markets.
  • Why: Outdoor screens carry no cookie or login, so buyers need a proxy for who is nearby, and scores supply one at the level of place and time.