Apple produces some of the finest types of mobile phones, and the iPhone 4 is no exception. Available at eBay, this phone is very thin at 9.3 mm and weighs only 137 g. The 3.5-inch widescreen retina display comes with extremely high resolution and touchscreen capability. As a multimedia device, it provides a resolution of 720p for watching videos, takes 5 MP still photos, and records 720p video. The FaceTime application allows users to perform video chatting. It also comes with Bluetooth technology and the reliable Apple OS. Like many mobile phones, the iPhone 4 provides Internet browsing and email access, but this model also offers a GPS and access to thousands of applications from the Apple Store. This phone lasts all day long, providing 840 minutes of talk time and up to 300 hours of standby time on its lithium-ion battery. Choose the Apple iPhone 4 if you want a phone that provides some of the best features in mobile phone technology.