IoT isn’t all brand-new, cutting-edge technology. In fact, some of it’s already suffering through painful upgrade cycles.

A case in point is the system that tells transit passengers in the tech hub of San Francisco when the next train or bus will arrive. The NextMuni system, based on the third-party platform NextBus, recently began sending out wildly inaccurate forecasts on many lines.

Why? Because most trains and buses had been communicating with NextMuni over AT&T’s 2G network, which was decommissioned on Jan. 1. The San Francisco Municipal Transportation Agency (SFMTA) said Friday that about 70% of its vehicles haven’t yet been upgraded with newer 3G technology. It was awkward timing, as that same day, the agency was playing up its innovation credentials as it announced a federal grant to fund six transit pilot projects.

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