On an iPhone, the message will say “No SIM” in the status bar next to empty network bars, and a “No SIM Card Installed” or “No SIM available” message will appear in a pop-up and in ...

However, if you don't have service, or if your iPhone doesn't have a SIM card, you won't be able to see this detail. However, even without a SIM card or network connection, you can easily find the ...