My blackberry curve says sim card rejected

This means you may need a new sim card, or there is something wrong with the slot you put the sim card into. Take the phone in to T-mobile and have them check it for you. You may just need a new sim card. Worst case, your phone is failing/failed.

Do you want to insert other network sim or if your Blackberry Curve 8350I displaying insert sim card,if already sim card inserted.Don't worry i will help you.You can insert other network sim card in the phone by unlocking the phone from current network lock.To unlock Blackberry Curve 8350I use unlock code.Visit the site Wickedunlock.com get unlock code and unlock it easily.Then insert any GSM network sim card.If the phone displays insert sim card even though sim card is already in the phone.Please remove the sim card and replace it correctly.It is because the phone didn't detect the sim correctly.After inserting if it is display invalid sim or sim not valid message on the screen.It is locked to some network,you need to unlock it.To unlock use unlock code.Get code from online site and unlock it.

I have the same problem with my curve 9360. It reject the sim card, but it was wordkinh all right:

You must have blackberry curve 8520 unlock code for verizon network before you can unlock your blackberry. That code can be obtained from verizon or third party sites, both of them will take you some charge for a straight blackberry unlock code, but third party sites more cheaper and quick delivery times rather than network provider.

Reflash your blackberry phone, it should be works and will make your blackberry camera curve 8300 unlocked. If that solution not working, bring your phone to nearest mobile phone repair shop and asking them to unlock blackberry using cable unlock. It's not only unlock your camera but also unlock your network if successful.

try unlock codes here http://www.theunlockspot.com/

Buy the new sim card from network operator shop.. they will give you the New sim and activate it

Take out the battery and sim card from the device and then check.
If problem persists take backup and reinstall the software using Blackberry desktop manager.
If still problem persist contact service center.

check whether sim card is working in different mobile or not ......if not working replace the simcard with the new ...

just take the SIM card out for awhile n pop it back in... if that doesnt work get ur sim card replaced..