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What if Xiaomi 5s can't make a phone call and can't answer the phone?

It used to work normally, but now it doesn't work. It should be a setup problem. Please see if there is any problem with the network settings of the mobile phone card. If there is no problem, you can change the mobile phone card to another mobile phone to eliminate the normal reason, and then restart the mobile phone. If not, restore the factory settings of the mobile phone. If not, there are many formatted mobile phones on the Internet, so you can search them. Finally, you can find Xiaomi's after-sales service.