Want to know the difference? CNET covers it in detail.
"I'm certainly not saying that feature phones are dead, at least not yet. If you're willing to shop around and wait a little bit, you can still get feature phones for as low as $30 with a two-year contract–smartphones aren't nearly as cheap. As above, the data plan requirements tend to be cheaper, and there are still carriers that don't require feature phones to have data plans. But I have a sneaky suspicion that as feature phones get more complex, and as smartphones get cheaper and easier to use, there will be a convergence: The advanced feature phone will become synonymous with the basic smartphone, and the only difference will be the operating systems.
" I think that manufacturers will still push the midtier and basic feature phones for that specific market, but the only way these devices will take off is if carriers will quit imposing these data plan requirements, or at least keep them on the low end."