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Is this all connections, or just mobile data? Is Wi-Fi affected too?
This could be the mobile network provider. Check if your SIM works in another device. It may be worth contacting them to inquire about any outages.
Go to Settings, then select General management. Scroll down and find Reset. Step 2: Reset mobile network settings. Then tap the Reset settings button. Finally, press Reset again. Also, reset Wi-Fi and Bluetooth settings.
