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If you value Samsung Pay, Secure Folder, or OTA updates, . If you already own one and want cellular functionality back, use the guide above with caution and always backup first.
If you are trying to fix a specific device, I can give more targeted advice if you share: Model Number (e.g., SM-G998B or SM-G998X for LDU) Security Patch Level (found in Settings > About Phone > Software Information) (Exynos or Snapdragon) I can then check if a method exists or if a Patch Cert is required for that specific version. samsung ldu imei repair