Repurposing old Android phones into security cameras often leaves SIM cards unused, which can lead to unexpected behavior like data usage, lock screen issues, and potential security risks. The key takeaway is that a SIM card isn't actually needed for basic camera functionality on Wi-Fi, and removing it or disabling mobile data is often the best practice. For those wanting to stream externally, a single, carefully configured data SIM with limits is necessary, but users should be aware of potential limitations in mobile data accessibility.
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