In the latest firmware there is still an issue wit calendar event notification, which on the Miband4 shows a lot of boxes with question mark without any reason to do so. On the notification on the phone there is clear text with spaces between.
After latest MiFit update, the band firmware is 1.0.5.40
Now in polish language (app) i have option for Call contact info.
The band is still in english (no polish fonts). The screen is less responsive to touch/swipe (it was due to one of custom watchface)
I gave Global version