When posting a bug report, please mention the steps to replicate and affected version. Reports with screenshots, screen recordings or logcats will potentially be resolved faster.
Mandatory report format:
Affected version: MK71.2-sogit-201801061824-NIGHTLY
Steps to replicate:设置—SIM卡—SIM 卡1设置/SIM 卡2设置—运营商设置
If you do not follow the format above when posting a bug report, it will delete or automatically be ignored. Without sufficient information, it is impossible for us to debug. Most probably the issue could be caused by your own inappropiate usage.