iPhone 4S vs iPhone 4

iPhone 4S didn’t come out on top here, but is it so much better that you need to upgrade? Well, if games aren’t your thing and if the idea of Siri doesn’t drive you wild with excitement, then the answer is probably no. Sure, it’s got a better cameraand takes video at a higher resolution andit even has a marginally longer battery lifetoo, but none of this is any reason to try to buy your way out of a contract. It's also arguable as to whether 4G connectivity or AirPlay Mirroring - which only works with Apple TV anyway - is really going to add enough value for many people as well.

Form Factor -

IPHONE 4S 115.2 x 58.6 x 9.3mm, 140g

IPHONE 4 115.2 x 58.6 x 9.3mm, 137g

Display -

IPHONE 4S 3.5-inch, 960x640px, LCD with IPS

IPHONE 4 3.5-inch, 960x640px, LCD with IPS

Processor -

IPHONE 4S Apple A5 - dual-core ARM Cortex-A9 processor clocked at 1GHz.
On the graphics front, it’s an upgrade to a dual-core PowerVR SGX543MP2 GPU and there’s, again, 512MB of RAM in support

IPHONE 4 Apple A4 - 1GHz ARM Cortex-A8 CPU with a single Hummingbird core and PowerVR SGX 535 graphics processor GPU
There’s also 512MB of RAM to back it up

Camera -

IPHONE 4S 8MP rear, VGA front, 1080p video

IPHONE 4 5MP rear, VGA front, 720p video

Connectivity -
IPHONE 4S HSPA+, GPS, BT 4.0, Wi-Fi, ant. switching, AirPlay Mirroring

IPHONE 4 3G, GPS, BT 2.1, Wi-Fi

Battery Life -

IPHONE 4S up to 8 hours 3G talk time

IPHONE 4 up to 7 hours 3G talk time

Software -
IPHONE 4S iOS 5 + Siri
IPHONE 4 iOS 5

Storage -

IPHONE 4S 16/32GB/64GB

IPHONE 4 8GB

Price -

IPHONE 4 $99 (8GB)

IPHONE 4S $199(16GB)/299(32GB)/399(64GB)