Reviews of iPhone 4 - Overview

DESIGN & BUILD
Apple Inc. gave the iPhone 4 a design renovation from the earlier 3GS version which is 0.37 inches thin only, compared to its predecessor which is 0.48 inches.

On the exterior of the iPhone 4 there is no plastic, and the standard silver bezel that was the trim to all previous iPhones is now gone. Front and back now is glass. Theoretically, the glass used is 30 times tougher than plastic and is equivalent to the strength of sapphire crystal.
An aluminum strip is between the two pieces of glass that wraps around the whole phone. They have this metal trim that serves as an antenna for 3G, Wi-Fi, GPS, and Bluetooth, which helps signal significantly and it’s the coolest part.

Display
At first look up on the display of the iPhone 4, it is simply attractive. And this is one of the best improvements on the new model without a doubt. Its new screen resolution is 960 x 640 up from 480 x 320 on all earlier iPhones and iPod touches.

From the time when the screen didn't get any bigger, there is a lot more pixels per inch now 326 to be exact. Presently, on the market there is no other smartphone with a screen of this resolution. It is almost like a digital print to the human eye.
A matter of time before will be updated to support the resolution of all the current applications.. Developers should do extra little work to make this change. Different story will be complete if Apple increased the screen size of the iPhone, but I can’t even see that happening anytime soon.

Buttons and Controls
They have this standard “Home” button in the front of the iPhone 4 along with it is the proximity and ambient light sensor and a VGA front-facing camera is the biggest change with the previous models.

Outside of the device around it, you can find the standby button, the new microSIM slot (which has some improved benefits over the standard SIM card), a speaker, a microphone, another microphone (that helps remove background noise), a headphone jack, a silent toggle, and two separate volume buttons.