Probes and counters measure what the network served, not what the device received. Drive tests sample a sliver of geography a few times a year, at fleet-and-fuel cost. App-based measurement needs installs, OS permissions, and battery budget — and doesn't exist on feature phones or headless IoT. The result: coverage complaints you can't reproduce, roaming quality you take on your partner's word, and churn drivers that hide inside averages.
The SIM sits between the device and the network in every cellular product, under operator control. An applet there observes service state, signal quality, call outcomes, rejection causes, and cell context — for every subscriber population, on every OS, at home and while roaming. No installs. No permissions. No hardware.
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An always-on, subscriber-level view of real service quality across your entire footprint and roaming partners — at a fraction of the cost and coverage limits of probes, panels, and drive tests. Evidence for engineering, care, procurement, and regulators from one source of truth.