Hello federico.chiarlo,
Thanks for using Apple Support Communities.
Based on your post, I see that your iPhone's screen is dark, and if you press the lock button a voice says that the screen is locked. You have tried to reset the iPhone using iTunes, which worked in iTunes, but then you still have an issue with the black screen and received a no SIM message, and to insert the SIM and reconnect.
I rely on my iPhone daily. So, I know how critical it is that we get this issue resolved. I have a couple of things that I would like you to try.
First, if you have a backup of your iPhone, I would recommend trying to restore to that backup and see if it resolves the issue. The following article will help:
Restore your iPhone, iPad, or iPod touch from a backup
Then, use the article If you get an alert about the SIM card in your iPhone for the SIM card alert, specifically, this section:
- Make sure that you have an active plan with your wireless carrier.
- Update your iPhone to the latest version of iOS.
- Go to Settings and turn on airplane mode. Wait about 10 seconds, then turn off Airplane Mode.
- Restart your iPhone. Press and hold the Sleep/Wake button until you see the slider. Drag the slider to turn off your device. Then press and hold the Sleep/Wake button again until you see the Apple logo.
- Check for a carrier settings update. Go to Settings > General > About. If an update is available, you'll see a prompt to select OK or Update.
- Remove your SIM card from the SIM card tray and then put the SIM card back. Make sure that the SIM tray closes completely and isn’t loose. If you use a SIM tray from a different model iPhone or from another phone manufacturer, it might not fit properly.
- Try using another SIM card. If you don't have one, go to your carrier's retail store and ask them to test with another SIM card. You might need to replace your SIM card.
If you still see an alert about your SIM card, contact Apple support.
Best Regards.