“No SIM Card installed”
If you are experiencing the “No SIM Card installed” error on your iPad, and you did have a working SIM installed, here are some steps to work through to get you back up and running.
1.) Turn the iPad onto Flight Mode
leave for 30 seconds, turn off Flight Mode. Sometimes the iPad doesn’t roam between cells very well and needs to renegotiate with the cell tower.
2.) Reset network settings
This will reset all network settings, including passwords, VPN, APN, and Wi-Fi profile settings.
* Tap Settings.
* Tap General.
* Tap Reset.
* Tap Reset Network Settings.
* Tap Yes to confirm.
3.) Remove and re-seat your SIM
If the SIM is unseated you can lose reception (dropped the iPad recently?)
4.) Test a known working SIM / Test SIM in 2nd device
* If the SIM will not work in a second device and a 2nd SIM works in the initial device you have a faulty SIM. Some SIM cards are faulty, you may need to obtain a new SIM card – check with your telco.
* If the SIM works in a 2nd device and a new SIM doesn’t work in the initial device, you may have a hardware fault (Apparently there is a problem with the pins that read the SIM card). This is harder to resolve as you’ll need to perform the Apple Repair shop hoop jumping exercise.
Visible Procrastinations 
Thanks, it worked.
Thanks!!!
Didn’t work for me…….:(
Does your SIM work in another iPad?
Yes but it didnt work anyway
Flight mode works but sporadically
Toggling into and out of “Flight mode” enables the SIM?
None of the above worked for me 😦
Did the SIM connect in another device?
I have two Ipad2, only in one of the m the same Sim card works. I tried ALL the solutions before….reset, upgrade, jailbreak, flight mode (it works during a week), ……
Looks like you have a hardware fault and will need to take the iPad back to Apple
:(((((((
worked for me! yay!
Remember that as the SIM card ages it accumulates oxidation deposits on its surface. Try a CLEAN pencil eraser rubbed gently over its surface on the contacts side (of course). Put it back in place and this error message no longer appears. Worked for me, and at a speed many times greater than online support!
This one worked for me! (None of the other suggestions did.)
This worked for me as well!
Thanks a lot guys I literally had tears when few people told to replace your ipad but it worked with the flight mode and settings change…
Thank you so much! Dropped my iPad for the first time just now and freaked out. Toggling the airplane mode for about 30 seconds worked right away!
Thank u so much it worked
Reseated the SIM card and it’s working! Thanks!!
Yes!!! Thanks… reset network settings worked!
yeeeyyyy… it worked. thanks!!
IT REALLLY WORKS FOR MEEEEEEEEEEEEEEEEEE THANK YOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU U R AWESOME DUDE
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ill do everything still not working. no sim installed at all
U-DA-MAN !! #3 did the trick. also viewed youtube video prior to removing card. gave me a little more confidence.
If you happen to get to point #4 and the sim works in another device it might not be a hardware fault. You might actually have something in the SIM card slot preventing the SIM card from being read properly.
What you should do before taking it to the local Apple service shop is to remove the SIM card and then gently blow in the SIM card slot with pressurized air in a can or with a compressor.
OBS! If you are using a compressor you should do it gently since they can be very strong. OBS!
The above actually worked for me when nothing else did!! Saved me $295 that they wanted to fix my “hardware fault” at the local Apple repair shop!
Hope it works for you too! :^D