My iphone 4s (ios 6.1) doesn't recognize my sim card with 3g

I've been using my iphone's 3g for 2 weeks, but now it stopped working, whenever the 3g logo appears on top of the screen my phone stop working, i can't even recieve calls or send a text messeage, but when the E appears (EDGE i think) the phone works or either without the mobile internet, maybe is the sim card, i cut my old sim manually to turn it to a micro-sim, or the software, i heard that iOS 6.1 crashes a lot, i'm using an argentinian carrier

Hello, ClayJM.
Good job on your attempts to troubleshoot the issue already. Wanted to point out a good article I found:
iOS: Troubleshooting applications purchased from the App Store
http://support.apple.com/kb/ts1702
Although it states it's for purchased apps it has specific steps to try that might still be helpful in your situation. Specifically Steps 4 and 5 have always been useful for me:
4. Restart the application
If the issue affects only a single app, try closing just that app:
Press the Home button to return to the Home screen.
Double-tap the Home button to display recent apps.
Tap and hold the affected app until the red minus appears.
Tap the red minus to quit the app.
Press the Home button, then restart the app.
5. Restart your device
Hold the Sleep/Wake button until "slide to power off" appears. Slide to power off your device. When it is off, press the Sleep/Wake button to turn it back on.
Thanks for reaching out to us on Apple Support Communities.
Cheers,
Pedro D.

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