My Xiaomi 2S can't make phone calls and send text messages after changing the mobile 4G card.

1. Maybe the mobile phone card is not installed correctly. Please try again.

2. It may also be that the problem with the mobile phone card makes it impossible to make phone calls and send text messages. You can change a card to test it.

3. Or it is caused by system problems. You can try restarting your phone. If necessary, the mobile phone system can be restored to the factory setting state or upgraded to the latest version.

4. In addition, the hardware failure of the mobile phone will also lead to the inability to make calls and send short messages, such as the failure of baseband or RF antenna, internal circuit, motherboard chip and other components. And you need to contact Xiaomi to repair the mobile phone after sale.