Apologies for dumb question

could someone answer my question please, i thought 3g was for the internet why are people talking about it in other terms? what does it have to do with calling people? thank you and sorry for dumb question

The first iPhone only had 2G (2nd Generation) data network. The new iPhone connects to the 3G network (as well as the old 2G). The phone will only talk to one or the other at a single time. It cannot run on both at the same time.
So with that in mind, everything that you do is going one network or the other. Some people are seeing differences in call quality between the two. Everyone sees that using 3G make a big impact on the battery life (it uses more power).

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