https://us.community.samsung.com/t5/Galaxy-S21/S21-ultra-Signal-loss-problem-after-uploading-to-one-ui-7/m-p/3232254#M95082 Try E-sim or try to change your old sim card with new one, it should work Mon, 12 May 2025 09:00:18 GMT userzo20ozx2yb 2025-05-12T09:00:18Z