3G Problem - Not connecting

Hi,
I have an iPhone 3G and for the past year I have had a problem with it. After an unknown amount of time, the iPhone will refuse to send/recieve any data over 3G. The 3G symbol is still there, and I know I am in a 3G spot. Turning the iPhone off and back on solves this and I can use the internet/check emails etc. again.
Any ideas how I can fix this?

Hi Prakashkarthikeyan,
If you are having an issue with your cellular data connection not linking up properly, I would suggest that you troubleshoot using the steps in this article - 
iPhone cellular data connection issues
Thanks for using Apple Support Communities.
Best,
Brett L 

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