Xiaomi 1S can only receive short messages, but can't send ~ ~ ~ What's the matter? I can't get the center number ~ ~ ~ mine is Unicom's card

1. It is recommended that you uninstall your system security software, enter recovery (shutdown, press and hold the volume on+power on key to enter recovery), clear the cache, and try to recover;

2. Please make a good backup of your data, enter recovery to clear all data (turn off the machine, press and hold the volume up+power on button to enter recovery), and do not install third-party system security software for the time being to see if it can be restored to normal.