No Sim Card on iPhone 4G HELP please!

I had this problem and noticed in settings, the Airplane Mode had switched to "on" and Wi-Fi had switched to "Off".

Turned AirplaneMode Off and Wi-Fi on. No problem since then.

ATT has replaced my sim card and the problem reoccurred. Yesterday, I called Apple on my wife’s new Iphone 4 and in the middle of the call the “no sim card” message appeared on hers and cut me off twice. I finally got through on a land line. After getting a tech who needed to discuss the matter with her supervisor, I found that Apple is getting many complaints about this problem. They were willing to replace both phones but she said they still don’t know what is causing it but it does not appear to be hardware related. She said that there was no guarantee the new phone would be any better but that many customers were resolving the problem with a total restore from Itunes. I had done a restore but according to Apple you have to do a restore and click “restore to new phone status” which will put all apps back on but require all settings to be redone. It has been 14 hours and both phones are working find. It does appear that this is a software and not a hardware problem.

Mine goes "No Sim" when I charge it. Does not matter if it through my laptop or through th wall outlet. Any ideas.

Same thing on mine. Three times today. Powering down and turning back on brings it back. ATT store had no ideas.

I've run into this problem at least 4 times today. Rebooting the phone about 3 times seems to help. It seems to occur when I get poor reception (e.g., in my pocket or somewhere with bad coverage). I think its a software issue related to the "palming your phone" bug...

Thank you for the info about putting the phone in airplane mode. This solved my problem for now too. I don't know if there is a hardware or software issue here. But this error message about no Sim card came out of nowhere for me. The iPhone 4G experience has not been a good one so far.

It is happening to me since this afternoon 5 times. I preordered the phone and in the billing is itemized SIM card. Working find since last Wednesday. My solution to turn off completely the phone and then on... it comes back OK but still the problem persist since in matters of 6 hours it has ocurred 5 times. Is there a good solution for this issue?

I have been having the same no sim issue as well multiple times a day. I have already replaced the sim with AT&T on the 25th. That did not fix the problem. I then tried a restore yesterday. Everything seem to be working fine until I paired the phone with the bluetooth in my truck (Ford Sync) around lunch today. Then I started to see the error message again. After turning bluetooth off, I am no longer having the issue. WiFi is always on though. This leaves me to belive that there is an issue with bluethooth. For people having the same issue, do you have bluethooth turned on?

Yes, bluetooth is on and the NO SIM problem developed while driving. I had just paired the phone with my car the night beforehand. For the previous several days I didn't encounter this problem and bluetooth had been off. Interesting theory. Others with similar situation?

Message was edited by: gfs2008

I just got the same issue. I was watching a video on my phone while eating lunch. I went to leave and kept the headphones in my ears, but locked the screen and put my 32GB iPhone in my pocket. When I got out to my truck, I went to unlock it and nothing was responding. The home button and the lock button wouldn't do anything. I had to hold down both buttons and hard reboot it. When it came back up, it said "No SIM". I took the SIM out and reseated it and toggled airplane mode on and off. I then had service. I then look down a few minutes later and see "NO SERVICE" at the top. It took rebooting the phone again to get it to reconnect to ATT.

I had no bluetooth turned on when I had my "No SIM" error.

It turned out my SIM Card was bad, according to the Genius bar tech. I got a new SIM from the AT&T store. So far, things are OK. Voice quality has improved too. The Bluetooth theory may be a fluke.

Good to know and thanks for the tip. I will go to AT&T store since my phone was out almost all day due to "no SIM card" err. It worked after trying to pull the SIM card.

Same deal. I am still in the 14 day return. However went to Regents Street store in London today. The queue to have someone from Apple look at it is around 5 days long! You have to actually book an appointment. This must be a world record for a returns queue.

It disconnects with the no sim error message roughly 8 times a day. Switching airplane mode on and off allows it to re-connect. It drops the signal whether making a call or not. Have swapped the sim for another one, no joy. However I have noticed that the sim card tray seems to badly fit the sim. The contact window in the tray is not properly aligned.
I have an appointement for Tuesday evening, so will see if it can get fixed. If not it is an HTC phone for me. If this really is a hardware issue how did this past testing? Its a phone, making phone calls should have been tested before release.

Same issue. Just got my 4 today and was setting it up tonight and got the message. Then again and again. Sometimes airplane mode works, sometimes rebooting. Looks like I need to stop back at apple tomorrow. let me know if you hear anything else. Love the phone, but definitely annoying...