I purchased this model in 11/18. About 6 months after I started getting SIM Failure and No SIM errors. After a day or two the iPad lost all indications that I had cellular. The cellular screen was blank and nothing could be added. Everything about cellular disappeared from the About screen. After going through resets and every fix the techs could think of my iPad Pro 11 was replaced. This was fine for about two months, then the SIM Failure and No SIM errors started up again. I got it replaced again. It was fine for about 2 months again and now once again the same thing is happening. It is intermittent and then goes away for awhile. Has anyone else had this experience? I just upgraded to 13.1.2. The problem still continues. I am only using the embedded SIM in the iPad. I have AT&T.