Biometric Data Mismatch SIM Error occurs when the biometric details (like fingerprints or facial data) linked to your SIM registration don't match the official records, often due to incorrect data entry or outdated records. To fix it, you need to update your biometric information at your mobile service provider's customer service center or authorized franchise. https://ulystar.in/blogs/13197/What-Is-Biometric-Data-Mismatch-SIM-Error-How-to-Fix