Since I updated to ios 6.0.1 i have the invalid sim message

Question

When I first got the iphone 5 the day it was sent out, I had a msg about an invalid sim car (Sprint) and they replaced the sim card and no problems until I upgraded to ios 6.0.1 yesterday, now the same msg again! Anyone else have this happen with upgrading to ios 6.0.1?

Answer 1

This is a repost from a similar thread:
This is why I do NOT do updates when they first come out. I just updated to 6.0.1 yesterday (Nov. 14) on my Sprint iPhone 5 and shortly thereafter got the "Invalid SIM" message preventing me from making calls or having any data connection. As others experienced, I could restart the phone and it would go away, temporarily... but eventually return. Great... as I'm going on a 5 day west coast work trip Friday.
I called Sprint tech support and they wanted to take me through the typical b/u & restore process. I have not seen one person reporting that this permanently fixes anything. I said, thanks, but I can do that on my own time later if need be. I put more stock in others' experiences that a new SIM card was the only true fix.
Next called the Apple Store near me to make an appointment. The girl made several attempts to convince me to call Apple Care instead to deal with this issue. I told her I didn't get AC but she said everyone gets one free session within first 90 days of a new iPhone. I insisted on a Genius Bar tech appointment, which was made for this morning.
At the appointment the tech said he never personally has dealt with this problem. I told him what I had read about likely SIM card corruption caused by the 6.0.1 update process. He disappeared with my phone into the back room for a long time. I'm starting to think Wut T F? Then he finally emerges with a brand new Sprint SIM as he's busting it out of it's perforated plastic holding tabs. He said Apple acknowledges that this is the official fix but he had a hard time finding one for Sprint. Replaced the old with the new, turned the phone on and it has worked fine since, OS 6.0.1 still intact and no re-activation through Sprint needed. (Unless he did something I was unaware of regarding updating SIM info. to Sprint). I really don't think so, since I asked him, "Don't I have to reactivat the phone with Sprint because of the new SIM card." He answered, "Sprint's SIM card does nothing in that respect."
OK, then... but my iPhone 5 seems back to normal.