Hey there, @Mandopresh. We hear your feedback and we are truly sorry that you have been getting such experience with the phone.
Please be advised that due the fact the iPhone 11 Pro is relatively new, the unlocked ones may be getting this kind of issues.
Also, we are waiting on new SIM cards in our inventory that are properly configured to work well with these new models.
We will definitely help you with a SIM card replacement once available, meanwhile, your patience is highly appreciated.