<Conclusions>

Unlike feature phones, Smartphones use open operating systems. This allows developers to create applications for the phones, making the phones highly extensible. As you look for a smartphone, remember to consider such features as size and weight, the electro-mechanical and software user interface, available memory, battery power and connectivity to your computer.

And, remember the four immutable rules of smartphones.

All smartphones are not created equally. You need to fit a phone to your way of life. Because you usually have to buy a phone, whether smart or not, with a one or two year service plan, look for deals that give you at least a month to return the phone and cancel the contract if you're not satisfied. You can also shop the brick and mortar stores run by local carriers. There you can get a feel for the phones available and see just how smart each smartphone is for you.