Just yesterday, I installed CyanogenMod 12.1 onto my 2013 Sprint Moto X (ghost) using ADB and TWRP (I'm not rooted.) Everything was working just fine until about an hour ago. I noticed a strange message on the lock screen, which says "No SIM card - Roaming Indicator Off". I have verified multiple times that there is indeed a SIM card in the tray, and I can make and receive calls/texts just fine, even cellular data works just fine. What does this message mean? Should I be concerned about it? Will it affect my phone negatively?