No SIM error on iPhone 3G

I had that problem with my 1st gen iPhone. I had to take out the sim, clean contacts and noticed the sim card was a little warped. I gently took the warp out of the sim by bending it a little and it has never done the error since.

this happened to me too. thanks for the tip. i didn't even think to check the sim...

Hi you guys,

I'm new around here, i had the same problem, found this solution, it's quite similar to the one suggested here, so i guess this is quite a popular problem. This is what i found -
http://www.fixya.com/support/t777183-no_sim_card_installed


I hope i helped a bit,
have a good weekend,
Julie.

had an actual problem with my SIM card

I am an addict and could not wait to get to the store so I first tried resetting "network" and then "all" settings to no avail. After also tring to remove and replace the SIM card without that fixing the problem I decided to look at my actual SIM card for problems and when I did I found a tiny piece of something that was bridging the gap between two of the connector plates on the card. The gap is tiny but I saw it and removed it by brushing it away with my fingernail. When I inserted it back in the phone it came right up.

Maybe I am lucky or maybe this was a real fix but worth looking at if you are having this issue I guess.

cheers

I live in the SF Bay area, which has notoriously bad 3G network service, and my iPhone is about 9 months old. I went to sleep listening to music on my iPhone and woke up to the "No SIM installed" message.

I'm in favor of starting with the least invasive solutions first, so I did a few hard reboots. It didn't work.

I read about resetting network connections as a solution and was about to do that next when I read somewhere to try putting the phone into "Airplane Mode" and doing a hard reboot, then taking it off "Airplane Mode". THIS WORKED for me. As soon as I took it off "Airplane Mode" it redetected the network.

I had this problem and it wouldnt go away. It just randomly started happening the other day. I had the SIM tested by O2 and it was working fine so booked an appointment with an Apple Genius and they replaced the handset there and then - the genius thought the SIM reader may have been faulty.

I dont know if maybe this is a larger problem and perhaps mine just died completely whereas others may just have temperamental SIM readers..

cleaning my sim card off worked, but it still read "No SIM" until I turned airplane mode on then back off. fired right up away after that. yay