5800 not reading sim cards anymore!

hi guys, I am in the UK on the O2 network and i just recently cancelled my contract with them. I was using the 5800 with this contract and it was cancelled today when i checked my phone and there was no operator signal.
So i proceeded to switch that simcard to one of my other contracts and now the phone won't work with the other simcard(o2 as well). The phone is unlocked( i paid to unlock it), and now whatever sim i throw into it it just says "insert simcard" when i go into the network settings.
What has happend?

Hey Kevz65, Welcome to the Nokia discussions forum!
Here are some steps to help figure out what is wrong with your phone, and hopefully in the end get you up and running.
-Ensure that the SIM card is inserted correctly. For device specific instructions how to insert SIM card, refer to the User Guide of your device available either in the sales package or on the local Nokia web site.
-Ensure that the SIM card is attached tightly and properly in the SIM card slot. The SIM card lock is not bent or damaged and it is closed.
-Use the original battery that comes with the device.
-Try with a new or different SIM card. If another SIM card does not give error message, contact your network operator or service provider to verify that your SIM card is not corrupted or is properly configured.
-If the problem persists with another SIM card, please contact Nokia Care.
If your SIM card reads "Not Accepted", your first step would be to contact your network operator or service provider.
I hope this helps!
Sheldrick
Press the 'Accept As Solution' icon if I have solved your problem, Kudos my post if my advice has helped you!

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5800 not reading sim cards anymore!

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