3G data on my iPhone 3gs isn't working?

I have 3G turned on, and for the past several days it hasn't been working consistently, it won't always connect and it'll tell me there's no current connection. It works perfectly fine on Wi-Fi though. Is there any way I can fix the connectivity with the 3G?

Added (1). I did a network reset yesterday, and I'm still having issues

Reset all connections

Contact your carrier in that case.

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