What can and cannot be measured across devices?
Cross-device measurement links eligible interactions from different devices when the implemented solution has the necessary information and the applicable data-processing conditions are met. TradeTracker describes cross-device touchpoints and app events within Mobile Metrics. Confirm the supported journey, integration and reporting scope for your campaign before relying on those capabilities.
S2S describes communication between servers. A first-party setup describes where tracking operates. Neither automatically identifies the same visitor on a phone and a laptop. Consent choices, available identifiers, browser restrictions and the implemented connection can limit what is measurable. Real Attribution allocates eligible recorded contributions; it cannot recover every interaction that the implementation has not identified.
Related glossary: Cross-device tracking, App tracking, S2S tracking, Real Attribution