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Thank you for contacting Xiaomi Customer Support and I am Kuldeep and sorry to hear that you are facing issue with SIM Cards.
Kindly perform hardware test for the SIM of your device:
1. Go to Dial Pad
2. Dial *#*#6484#*#*
3. Select Single Item Test (If the option is available)
4. Select SIM Card
5. Follow the instructions mentioned over there
If the test result is positive would request you to follow the below mentioned steps:
Sign Out from your Mi Account:-
1. Go to Settings
2. Select Mi Account
3. Then confirm to Sign Out
Create a Backup: -
1. Go to Settings
2. Select Additional Settings
3. Select Backup and Reset
4. Select Local Backups
5. Select Backup
6. Select Accounts and Contacts & Deselect System
7. Then select Backup so that a backup would be created
For Finding Backup File:-
1. Go to Internal Storage
2. Select MIUI
3. Select Backup
4. Select All Backup
(Note: - Please save the backup file in your PC/ Laptop, so that your important data would be prevented)
Factory Data Reset:-
1. Go to Settings
2. Select Additional Settings
3. Select Backup and Reset
4. Tap on Factory Data Reset
Restoring Data:-
1. Go to Settings
2. Select Additional Settings
3. Select Backup and Reset
4. Select Local Backups
5. Select Backup File
6. Select Restore in order to complete this process
Hope that above provided steps will help you in a better way to resolve the concern
Please write us back in case you need any further assistance, we will be happy to help you.
Regards,
Kuldeep
Xiaomi Customer Support