Yes, I have been having that issue since I got the phone in November. Originally, it was very sporadic, but at the end of February,it started getting progressively worse...to the point it was happening 4-5 times a day. I began taking a screen shot of the screen each time it happened. (I tried all of the tips offered on the other thread in this forum: reseating the card, cleaning the card, blowing out the slot with compressed air, changing some of the phone settings,etc. The screen shots were good evidence of the issue, and Verizon finally sent me a new SIM last Wednesday. I installed it, but still was experiencing "No SIM" (usually only once or twice a day). I called Verizon support again, and they said I needed a software update, but when I checked the phone, it said the software was already up to date. Over the weekend I called again, and the Tier 2 support rep told me there was an issue with the SIM card tray, and they will replace the device. Hoping that fixes the issue...