Q: i just bought a new sim card, why is my iphone still saying no SIM? i am unable to use my phone call, text, ect....

Hello jaymecaroline,

Thanks for using Apple Support Communities.

The steps below will help you in resolving this issue of your iPhone giving you a No SIM alert.

1. Update your iPhone to the latest version of iOS.
2. Toggle Airplane mode On and Off.
3. Try turning iPhone off and then on again.
4. Check for a carrier settings update. Tap Settings > General > About. If an update is available, a prompt will appear.
5. Remove the SIM Card and verify that it is a valid, carrier-manufactured SIM. Also verify that it is not damaged, worn, or modified. Then reinsert it.
6. Restore the iPhone.

If you still are unable to resolve this issue, contact Apple support for further assistance.

iPhone: Troubleshooting No SIM

http://support.apple.com/kb/TS4148

Take care,

Alex H.