During advanced firmware flashing, rooting, or custom ROM installations, the phone’s systemic internal memory partition (EFS) can become corrupted. This can wipe out the IMEI (showing it as "0000000000000" or "Unknown"), leaving the phone unable to make calls. Why Changing a Google Pixel's IMEI is Nearly Impossible

Google Pixel Change IMEI: A Comprehensive Guide to Risks, Legality, and Realities (2026)

Pick a number (1–4) or describe your situation and I’ll provide a step-by-step, lawful guide.

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