List of GSC bits

GSC bit	Description
assistant	(not sure whether it is a GSC bit. iOS 5.0. Needed to enable Siri)
device-name-localized	(not sure whether it is a GSC bit)
device-name	(not sure whether it is a GSC bit)
still-camera	(Can take photos. iPhone OS 1.0 or 2.0+)
cameraRestriction	(not sure whether it is a GSC bit)
cellular-data	(Wireless modem)
any-telephony	(Cellular radio)
telephony	(Can make phone calls. iPhone OS 1.0+)
sms	(Can send text messages. iPhone OS 1.0+)
video-camera	(Can records videos. iPhone OS 3.0+)
auto-focus-camera	(Camera is not focus free. iPhone OS 3.0+)
h264-encoder	(Can encode audio?video? iPhone OS 3.0+)
wifi
accelerometer	(iPhone OS 1.0+)
magnetometer	(iPhone OS 3.0+)
gps	(iPhone OS 2.0+)
location-services
microphone
peer-peer	(Bluetooth "gaming" extensions, iPhone OS 3.0+)
opengles-1	(Supports OpenGL 1)
opengles-2	(Supports OpenGL 2)
armv6	(CPU can execute ARM6 instructions)
armv7	(CPU can execute ARM7 instructions)
displayport
hidpi	(Retina display)
front-facing-camera	(iOS 4.0+)
camera-flash	(LED flash, iOS 4.0+)
gyroscope	(iOS 4.0+)
contains-cellular-radio
volume-buttons
ringer-switch	(Mute button)
piezo-clicker	(Integrated non-speaker in iPod touch 1G.)
bluetooth
unified-ipod	(joined Music and Videos into iPod)
youtube
youtubePlugin
green-tea	(turned on in iPhones sold in China)

• not-green-tea
• wapi
• international-settings (Settings/General/International, wildly used in iPhone OS 1.1+)
• stand-alone-contacts
• delay-sleep-for-headset-click
• load-thumbnails-while-scrolling
• sensitive-ui
• apple-internal-install (Used in internal firmwares, displays a watermark with Apple contact info on device lockscreen, retail firmwares just show a "INTERNAL_INSTALL_LEGAL_DECLARATION" string)
• all-features
• nike-ipod (Nike+iPod internal (or external with hacked drivers) receiver, iPhone OS 2.?+)
• voice-control (Voice control available. iPhone OS 3.0+)
• proximity-sensor (self explanatory. iPhone OS 1.0+)
• gas-gauge-battery (Precise battery measurement, enables Settings>General>Usage>Battery Percentage. iPhone OS 3.0+)
• accessibility (Settings>General>Accessibility. iPhone OS 3.0+)
• mms
• encrypted-data-partition (Hardware encryption for 3GS and newer devices. iPhone OS 3.0+)
• encode-aac
• 720p
• fcc-logos-via-software (Enable PNG viewer in Settings/General/Regulatory)
• hide-non-default-apps
• ipad (Is iPad. used to be "wildcat".)
• data-plan
• multitasking (self explanatory)
• venice (FaceTime)
• voip (VoIP multitasking??)
• io-surface-backed-images
• tv-out-crossfade (Photos app slideshow transitions enabled)
• hd-video-capture
• hdr-image-capture (HDR, iOS 4.1+. Seems to depend on camera-flash on 4.3+)
• hw-encode-snapshots
• hw-snapshots-need-purplegfx
• gamekit (Game Center)
• additional-text-tones (New SMS sounds officially only for the iPhone 4 (except on iOS5 betas??). iOS 4.2.1+)
• hardware-keyboard
• hall-effect-sensor (Very likely the magnetic sleep switch on iPad 2)
• photo-stream
• multitasking-gestures
• display-mirroring
• telephony-maximum-generation (Modem type. 2.5 = EDGE 3 = 3G 3.5 = HSDPA)
• hiccough-interval (Unknown)
• marketing-name (Brand name of your device e.g. "iPhone 3GS")
• launch-mode (iPad SpringBoard orientation??)
• application-display-identifiers
• tv-out-settings (not sure whether it is a GSC bit, sounds like a SpringBoard property)
• screen-dimensions
• main-screen-width
• main-screen-height
• main-screen-scale
• main-screen-orientation
• explicitContentRestriction
• enforce-shutter-click (Forces camera click even in silent mode in Japan and another country I don't remember -- look in Regional*.plist files under Celestial fmwk)
• enforce-googlemail (Shows Google Mail logo instead of Gmail in the UK)
• serial
• post-animate
• pre-animate

• MapKitUserShiftingNonGreenTea (not sure whether it is a GSC bit, also green tea = for chinese market)
• MapKitUserShiftingGreenTea (not sure whether it is a GSC bit)
• MapsUserShiftingNonGreenTea (not sure whether it is a GSC bit)
• MapsUserShiftingGreenTea (not sure whether it is a GSC bit)
• MapKitAvailable (not sure whether it is a GSC bit)
• MapKitAvailableGreenTea (not sure whether it is a GSC bit)
• MapsVisibleGreenTea (not sure whether it is a GSC bit)
• MapsVisible (not sure whether it is a GSC bit)
• mars-volta (not sure whether it is a GSC bit - spotted in iOS 5.0.1b2 4S)