IPhone no longer recognizes the sim card in it although iTunes recognizes

the iPhone...I used the iPhone yesterday and I have NOT messed with the sim card but when I turned it on tonite, it says in the upper L corner = No Sim Card = it does see the Wireless netwrok
what do I do???

If a reset, as suggested, does not work, most of the time you can fix this by removing and reseating the SIM card.
1. Turn the iPhone off (hold down the Sleep/Wake button until the red slider appears, then slide it to turn off the phone.
2. Eject the SIM card tray (insert a small paper clip or safety pin into the tiny hole next to the headphone jack, push down firmly to make the tray pop out, then remove it from the phone).
3. Pop the SIM card out and then reseat it in the tray. Reinstall the tray in the phone.
4. Turn the phone on.
If this does not fix it, you either have a SIM card that went bad or a problem with the SIM reader. The next step would be to go to the AT&T store to get a new SIM card.
If you still have the problem with the new SIM, you need to have the phone serviced by Apple.

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