Invalide Sim notification

Ciao! Go to settings- SIM card settings and set both SIM cards as active, usually it helps. If not, reset the phone settings, the code is 1122. Spero che ti risolva la tua problema.

Try This:
1. Remove Sim Card
2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears
3. Replace Sim Card
4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.


Also, Try this:
1.) Shut down the iPhone 3G.
2.) Start up iTunes
3.) Hold down HOME button on the iPhone 3G
4.) While keeping the HOME button depressed, plug in the Sync cable
5.) A message will pop up to ask if you want to reset.
6.) Just click YES and the reset process should start.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

Thanks, Joe

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

I fear you cannot do that, without an actual "Jail Broken" iPhone.and or a Telecom NZ suitable phone.

If you installing SIM & it shows no SIM inserted then you have to unlock your iphone. After unlocking iphone you may use any GSM SIM in your iphone. If you are brought plan then check if your SIM if ok or its damaged.

You may ask your queries me at anytime, Happy to help you.

Thanks.

The sim card is located at the top of the iPhone at the middle, when you bought the iPhone it should have come with a special metal pick type object that helps remove the sim card. A paper clip should work just as well..
Here's a diagram that might help along with a video.

I've tried to lock the iPhone to my tele provider in stead of letting it search for available networks (the automatic option in settings). Seems to work. But I will also get a new sim card. Strange problem though...

Turn off the iPhone before inserting the sim, insert sim, turn on, import contacts. If you put the sim in the phone without restarting it for some reason it doesn't get all the contacts sometimes.

I too have had the "no sim card installed message. What has always worked for me is to go into settings and put the phone into airplane mode for about ten seconds and then switch back to regular mode which causes the phone to reconnect to the ATT network. The sim message goes away. This is also a good fix for when your phone isn't connecting to 3G or showing an "E" instead of 3G.

chk the message settings