My iphone 4s 3G isn't working anymore?

Is this because I have passed my quota? If it is fair enough but if not how can I fix it?

Go to your settings >general > network and make sure your 3G and cellular data are on… If it doesn't work put your phone on airplane mode then turn off airplane mode and try it

Try rebooting the phone. As long as it still turns on.press and hold the power button and the circle home button together.keep holding both until your phone turns off and back on again when the apple sign shows. This usually fixes the problem

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