What is difference in 3G and GPRS?

[10 points] GPRS is connecting (and being stupid) , while 3G is not ? Vodafone usb modem.?

I have been using the vodafone usb modem, for 6 months now, and it's been working okay. But 3 days ago, it would connect to the 3G connection, for like, 5 seconds, and then just disconnect, it's still doing this now. I can't stand the GPRS cause it's too slow, and I need to know how to make my 3G work again? I tried installing and re-installing the thing, but nothing, tried rebooting, but nothing, tried to change the port settings, but nothing! I really need help, cause, all my studying depends on my internet. 10 points for whoever actually gives me a reasonable answer :)
Answer:

Check with vodafone that they haven't removed 3G from your SIM. I had a similar experience with O2 when the 3G sim they sent wasn't actually 3G enabled.

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