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When an Android smartphone undergoes deep system modifications—such as aggressive firmware flashing, incorrect rooting, or custom ROM installations—the device's Non-Volatile (NV) RAM data can become corrupted. This often results in a "Null IMEI," an invalid IMEI error, or a "0000000000000" string, causing the phone to lose all cellular network connectivity, Wi-Fi authentication, and basic calling capabilities.

Here’s why, and it's important you understand this: " an invalid IMEI error