Everything You’ve Ever Wanted to Know About the iPhone 4

Posted on 08 June 2010, Last updated on 31 July 2015 by


a4 The iPhone 4 is running Apple’s custom A4 chip; the same chip that powers the iPad. Assuming that it is identical to the hardware running in the iPad, the iPhone 4 should be running at 1GHz and contain 256MB of RAM. The iPhone 4 comes in either 16 or 32GB capacities which is unfortunately the same max capacity as the prior 3GS, while the latest iPod Touch generation tops out at 64GB.

Battery Life

battery Apple claims that the A4 chip will improve performance while increasing battery life. Apple has traditionally been honest about their battery life figures. They claim that the iPhone 4 will run for the following (3GS figures for comparison):

iPhone 4 iPhone 3GS
Talk time (3G) 7 hours 5 hours
Talk time (2G) 14 hours 12 hours
Standby 300 hours 300 hours
Internet Use (3G) 6 hours 5 hours
Internet Use (WiFi) 10 hours 9 hours
Video Playback 10 hours 10 hours
Audio Playback 40 hours 30 hours


screen The screen is 3.5 inch diagonally with a resolution of 960×640 (326 ppi), which maintains the previous iPhone’s 3:2 aspect ratio (rather than the iPad’s 4:3) keeping it compatible with all existing applications. This is a large jump from all previous iPhone and iPod Touch models which featured resolutions of 480×320. Apple says that this is the highest resolution screen of any smartphone produced. The screen now uses IPS (in-plane switching) technology which Apple introduced on its iPad. IPS allows for good contrast and color at wide range of viewing angles. Apple claims that the iPhone 4’s 800:1 contrast ratio is 4x greater than the iPhone 3GS’s. If the iPhone 4’s screen looks as good as the iPad’s, people are going to be very impressed, especially due to the sharpness from the high pixel density. The screen is coated in a fingerprint resistant oleophobic coating just like the previous model.


The iPhone 4 continues to support 3G (HSDPA and HSUPA) which means up to 7.2Mbps download, if the carrier can support those speeds. Other wireless radios in the iPhone 4 include WiFi b/g/n (n at 2.4GHz only), Bluetooth 2.1 + EDR. For location data, the iPhone has A-GPS which uses cellular location data to find a faster location lock than GPS alone. The digital compass returns for precise directional information as well.


sensors Apple has thrown an additional sensor into the iPhone 4 in the form of a three-axis gyroscope which will allow it to sense additional forces. Apple is billing this as a useful new tool for game developers, and when tied to the accelerometer, it will enable the phone to detect an array of forces including angular velocity and rotation rate. The iPhone 4 retains the same proximity and ambient light sensors as the previous models.


iphone cam The iPhone 4’s camera system is receiving some significant upgrades over the previous iPhone. The resolution has been pushed from 3.2MP on the iPhone 3GS, up to 5MP and an LED flash has been added to light up low-light scenes. The new hardware in the iPhone 4 allows for 720p HD video recording (1280×720) at up to 30 FPS and the flash can remain lit as a light for taking video. Additionally, a front-facing camera with a resolution of 640×480 has been added. The front facing cam can be used for still images or video at up to 30 FPS. Apple’s new Facetime service allows for live WiFi video chatting between iPhone 4 users (more on this in the software section). Here are a few shots from the iPhone 4’s rear camera, which Apple says have not been modified (click to enlarge):

iphone 4 pencils iphone 4 grass

Noise-canceling Microphone

mics Apple pulled a move out of the Nexus One playbook by adding two microphones to the iPhone 4. With one mic placed near your mouth to pic up your voice, and another placed on top of the device to detect background noise, the incoming signal can be processed to suppress the background noise, leaving just your voice. This works much like noise-canceling headphones and will help to make your voice more clear, on the receiving end, in noisy places.

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5 Comments For This Post

  1. chippy says:

    I love it!
    This is the first Apple phone i’ve taken a real interest in because it focuses on battery life, camera, outdoor use and on-phone editing. Despite the lack of Xenon, I bet we’re going to see some amazing low-light performance. The Milestone XT720 will be one to compare it against although for on-device video editing, the iPhone will blow the Milestone away for sure.


    With the A4 chip and tight OS, it’s likely to be the fastest pocketable web browser. (Although a little short of Full Internet Experience)


  2. BRYAN B says:

    Perhaps the Nokia N8 would be a better comparison and the ability to directly connect a USB storage device has cinched the choice for me.


  3. yoyoblog says:

    The question ist how much bang you get for the buck. In Germany it will easily cost 700-800 € without contract, if your lucky enough to get one. For that money you can get a smartphone + digicam + mp3-player + internet-tablet and have still some change in your pocket.

  4. Shane says:

    Don’t forget to buy a bag too, to carry all of the above.

  5. DavidC1 says:

    The battery capacity is said to be 19% larger than the 3GS. That corresponds to 1450mAh.

    I have to admit they know how to perfect a design. One of the most impressive on the 3GS was the on-screen keyboard, no 3rd party or Windows based on-screen keyboard comes close to matching its simplicity and functionality.

    PS: I don’t have any Apple products, the 3GS is my friend’s.

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