For help, Redmi 4a suddenly can't answer the phone and send and receive text messages.

The mobile phone can't answer the phone. Solution tutorial:

1, restart the phone, press and hold the power button for a few seconds, and then restart the phone. If there is no response, you need to plug and unplug the panel before starting the phone.

2. Check whether there is a signal display in the upper corner of the phone. If there is no signal, or even the signal icon is not displayed, please try to plug and unplug the sim card again or replace the sim card.

3. Check whether the phone is in flight mode or offline mode. In this mode, the network is disconnected, so naturally you can't make a phone call. Just cancel this mode.

4. In fact, if you are not in flight mode or offline mode, you can still make a phone call a second ago. The possible reason is that running too many programs leads to a crash, clearing the memory, or there is something wrong with the system. This can reset the phone or brush the machine.

If you can't make a phone call or even refresh the system after resetting the phone, it is likely that there is something wrong with the hardware of the phone and it needs to be sent to Xiaomi after-sales maintenance center for inspection.