today i accidentally dropped my phone from pants pocket on floor and have "no sim" error message since. tried to reboot and reinstall sim card in slot, but it does not help. any tip how to fix this?

What about using another sim slot?

second one work. but still i want to fix it somehow. if its possible.

No official sim slot replacements are available on Aliexpress, at the moment, for a DIY repair.
You'll have to contact your seller, but i don't think he will honor the warranty considering that your device got damaged by falling.

At no cost you can check if your SIM slot metal cage is working properly, but nothing more.