How much RAM / memory does the iPhone 4 have?

The iPhone 4 has 512 MB of RAM (random access memory).

This doubles the previous 256 MB found inside the iPhone 3GS and first generation iPad. The iPhone 3G and original iPhone (2G) featured 128 MB of RAM.

The improved RAM specification on the iPhone 4 is expected to help run multitasking applications more efficiently and make it possible to render movies using a mobile version of iMovie.

What is the Apple iPhone 4 Retina Display?

As we know, the retina is comprised of light-sensitive tissue at the back of your eyeball and collects sensory information that ultimately forms what we see. Apple is hinting at the fact that the high number of pixels per inch (326 ppi) exceeds the capabilities of the human eye at 10-12 inches.

Because you're not capable of seeing more than 300 or so ppi at this distance, text on the iPhone 4 screen has the same quality as a printed page. No graininess, pixels or jagged edges are visible.

What programming language are iPhone apps written / coded in?

Apple restricts developers to writing iPhone applications in Objective-C, C, C++ or JavaScript as executed by the iPhone OS WebKit engine.

Apps must be originally written in one of these languages and may only use Documented APIs in a manner prescribed by Apple. Only code written in Objective C, C, or C++ may compile and directly link against the Documented APIs.

How do I change my iPhone root password?

Jailbreakers everywhere should be aware that the default root password from Apple is "alpine" and presents a security threat if SSH is installed. SSH can be uninstalled or switched off when not in use, however changing the password once will solve the problem.

To change your root password and help prevent unauthorized access to your iPhone:

1. Connect to your iPhone using SSH on your computer.
2. Type 'passwd' without the quotes at the command prompt and press return.

HD Video Playback on the iPhone 3GS

You may be aware that Microsoft's Zune HD will hit shelves on September 15th. The portable device will play HD video and compete with Apple's iPod Touch. What you may not know is that the iPhone 3GS is already capable of playing 720p and 1080p resolution HD video without skipping a beat.

Although the iPhone screen resolution is only 480x320 pixels, the possibility of future Apple devices linking to external displays for HD video playback is real.


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