Operating systems- iOS:
Pros- The iPhone 4 offers enhanced performance, a lovely new display, and an improved design. It also adds a ton of sorely needed features, both by itself and through the iOS 4 update.
Cons- Multitasking entails some trade-offs, and home screen folders are limited to 12 apps. AT&T reception continues to be spotty, and you'll need a case for the best calling reception. Also, we'd prefer a 64GB model.
Operating System- RIM Blackberry OS
URL- http://bit.ly/cAqxkN, http://bit.ly/cpdezP
Operating System- Android 2.2 Froyo
Browsers- Webkit HTML5 based browser; Adobe Flash 10, Pinch to Zoom
Processor- 1.2 GHz TI OMAP
URL- http://bit.ly/9MjNjo, http://bit.ly/bPfhI6
Droid-2-Global smartphone is that it is fully compatible with two different cellular network technologies, GSM and CDMA.
Operating System- HTC Surround, Samsung Focus and HTC HD7
AT&T- 3G, 4G
Sprint- 3G, 4G
TMoblie- 3G, 4G
Verizon- 3G, 4G