is 3G in my settings ( Cellular) data?
If you have an iPhone 3G is not cellular data. In order to acess cellular data, you need to go into Settings > Carrier and there you'll see cellular data. This is what you'l have to activate in order to use internet. Though, if you don't have data, you might get charged alot for using some data. I suggest you change your plan with one that has data in order to get charged reasonably.