iOS 7 "No Sim Card Installed"

Try re-seating the SIM card.

Replace the SIM card.

Same problem, 'No SIM', only not random, persistent. Have turned on and off multiple times, reinstalled sim card when phone both on and off, reset network settings, nothing...:(

Went onto Apple support assuming they would have a site specfiic for answering IOS update troubleshooting, and couldn't find anything.

Also having the same problem. Never had an issue until I updated yesterday. Now I'm getting NO SIM really annoying.

Restart corrects the problem but how lame is that. Now I have to keep checking my phone to see if it is working wth

Update: Same message 'No SIM' when I switched it into my ipad so the card must have been damaged by the IOS 7 update?! Went to Omantel, bought and installed a new sim, and voila, working. Happy now, but baffled as to how this kind of stuff is happening. Wasted 6 hours diddling around trying to trouble shoot this. BTW, where on earth is Apple Support during this whole IOS 7 troubleshooting process today??

Same problem, but restarts seem to fix it temporarily. I am going to the Apple Strore to get a replacement phone.

Same problem, fixed by reboot but it comes back randomly. Is the solution to get a new SIM??!

me too.

Obviously this is a software bug with iOS 7, as I never had the issue until the upgrade.

Now my phone is becoming useless for incoming calls and texts, since every few hours, I look at my phone and it says "No Sim card installed". I have to power down and back up to fix it.

Very bad bug - Apple, going to fix this ASAP?

I had too remove SIM card and reinstall it.

No problems ever since then

Has this been resolved? I get this issue on my iphone 5 almost every other day since upgrading to iOS7

It's a bug. Just like Messages not sending. Hopefully, Apple will fix this soon. But more than likely, it will be a while. Meanwhile, don't take it to Apple, the SIM is the carrier's deal. You should be able to get a new SIM if you take it to the them.

My wife has the same problem with iOS 5. I can wait for Apple to fix their screwed up products and admit it's their fault. It this point all you can do it to reset the phone, new SIM doesn't fix it.

Sorry I meant iOS 7.

I'm having the same issue with my iPhone 5. I updated to iOS 7 a few weeks ago but the issue just started today. Hope they fix it soon...

Also I tried taking out the SIM a few times and it worked for a few minutes and then stopped again.

This is happening to me as well. Im using iPhone 4S and upgraded to iOS 7. It now says no sim installed. I reboot, sim works for sometime and then a message shows that says invalid sim. What's happening here? Any remedies?