Download iPhone 4S Superguide

Chapter 1
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J) SIM Card Slot
The iPhone 4S is what’s
called a world phone, which
means that it can operate on
multiple cellular frequencies:
both the CDMA network
(used in the United States by
Verizon and Sprint), and the
GSM network (used in the
United States by AT&T).
If you’re subscribed to a
carrier that uses GSM, you’ll
need a micro-SIM card to
identify the iPhone to your
cellular provider; without an
active card, you won’t be
able to access call networks
or cellular Internet, only
Wi-Fi.
If you use a CDMA network, you won’t use a micro-SIM card in the United
States, only when you connect to your network’s GSM partners overseas.
If you bought your iPhone from an Apple Store with a GSM or CDMA
contract, the micro-SIM card should’ve been provided by default, so you
shouldn’t need to fuss about with it.
If you’ve purchased an unlocked phone (one without a contract) and you
want to switch to another GSM-based cellular carrier, or you’re planning
a trip abroad, you can remove the current micro-SIM card with a handy
paperclip. You can see Apple’s full list of supported spectrum bands on
Apple’s iPhone webpage under “Cellular and Wireless.”
K) Back Camera and LED Flash
On the back of the device is the second of two cameras, as well as an
LED flash. The camera sports an 8-megapixel CMOS backside illumination sensor, which snaps pictures at a 3264-by-2448-pixel resolution. (In
real-world terms, that would translate to a high-quality 8-by-10-inch
glossy print.) An attached hybrid IR filter provides better color accuracy,
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