A four-person sales team watched its connect rate fall for eight months. They rewrote the opener twice, moved calling to mornings, bought a better list, and ran a training day. Nothing moved. Then somebody noticed that one of the two numbers the team dialled from was doing roughly twice as well as the other: same list, same people, same hours. The poor number turned out to be a head-office number from an office the business had left in 2023, still sitting in the trunk configuration, no longer allocated to them. Calls presenting it were being dropped by two of the three mobile networks before they ever rang. Eight months of work on the pitch, and the actual problem was one line in a settings screen nobody had opened since the move. This is not an unusual story, and it points at something useful: when your own numbers perform differently against the same list, the cause is in the numbers, not in the market, the script or the team. There are two very different things that can be wrong: one is a rules problem that gets your call dropped before it rings, and one is a reputation problem that lets it ring and warns the person not to answer. They look identical on a dashboard and they need opposite responses. This is how to tell which you have, using two hours, four handsets and numbers you already own.