Apple's iPhone 4, Apple's flagship from 2010, is extremely outdated. And unlike the iPhone 4s, it did not get upgraded to iOS 8. It's stuck on iOS 7.
We can't recommend this device to anyone. It's slow, its camera is awful compared to the current crop of mobile cameras, and it doesn't come with 4G LTE. Oh, and it probably won't get updated ever again. Yes, it's cheap, but so are the iPhone 5s and iPhone 5c. And so is the iPhone 5, the device that replaced the iPhone 4s and delivered LTE and a larger screen to iPhone users for the first time.
Avoid this phone and get the iPhone 5, iPhone 5c, iPhone 5s, or the iPhone 6 instead. You can thank us later.