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Over the past decade, a growing number of municipal governments have experimented with replacing physical library cards with smartphone-based digital identification systems. Proponents argue that these systems reduce administrative costs, since libraries no longer need to print, replace, or mail plastic cards, and they allow patrons to access services instantly upon registering online rather than waiting for a card to arrive by post. Digital systems also generate richer usage data, enabling library administrators to identify which neighborhoods are underserved and to allocate new branches or mobile units accordingly. Some systems even integrate with municipal transit cards or school identification numbers, allowing a single credential to unlock multiple public services at once, which supporters describe as a meaningful convenience for low-income families juggling several bureaucratic systems. However, critics point to a significant equity concern: not every resident owns a smartphone, and even among those who do, older adults and recent immigrants are statistically less likely to be comfortable navigating app-based verification, potentially locking out precisely the populations that public libraries were built to serve. Battery failures, lost phones, and unreliable cellular coverage in rural branches further complicate reliable access. Privacy advocates have also raised concerns that centralizing identity data across municipal services creates a single point of failure that, if breached, could expose far more personal information than a simple library card ever could. In response, several cities have adopted a hybrid model, keeping physical cards available on request while defaulting new registrations to the digital system, a compromise that early evaluations suggest preserves most of the cost savings while avoiding outright exclusion of non-smartphone users. Whether this hybrid approach becomes the long-term standard, or whether digital identification eventually becomes universal, remains an open question that will likely depend on smartphone penetration rates and public trust in municipal data security over the coming years.