iPhone 5 "No SIM Card Installed" Error -- Replace nano SIM card
Please respond to this thread IF you've replaced the SIM card and had a recurrence of the "No SIM Card Installed" error.
Apparently a subset of nano-SIM cards shipped with iPhone 5s are slightly too small so they fit poorly in the SIM tray. A small percent of users have reported this issue and it has been solved by (a) replacing the SIM card from the phone carrier, (b) some success with cleaning contacts, reseating cards, (c) some have applied scotch tape to the non-contact portion of the card to beef up its dimensions. See the following thread: https://discussions.apple.com/thread/4327783?start=0&tstart=0. From that discussion, I conclude that replacing the nano SIM card virtually always solves this problem in a durable fashion (although we're talking a maximum of 3 weeks at this point) -- it seems like the safest and most straightforward solution (if it's a reliable solution).
iPhone 5