A smartphone is a smart phone
A smartphone is a (mobile) phone that you can do more with than just call: You can play games with it, you can use the Internet, you can edit documents, etc. Almost every phone you can buy nowadays is a smartphone. A smartphone is actually a desktop computer in pocket size, they are just as powerful as a somewhat older computer nowadays more games are being made for the smartphone than for a classic desktop. More apps are available every day and you can get almost anything with a smartphone (if you have Internet access) at a reasonable price.