Xiaomi 2 Unicom card can't send text messages

Hello, as you said, the SMS center number cannot be modified. Is "+7" displayed when viewing the SMS center number and cannot be modified? In this case, you need to upgrade the system to V5, and then you can modify the SMS center number. If it still doesn't work, you can only go to Xiaomi to test the mobile phone system after sale.

Tips: brushing the phone may cause the functions of all parts of the phone to be unusable. I suggest you find a professional to adjust it for you. If not, please contact Unicom customer service to check whether the SMS function of your mobile phone card is turned off.