Jailbreaking lets you have full control over your device. This can be dangerous if you don’t know what your doing. The first thing you will notice after Jailbreaking is an app called Cydia, this lets you instal Packages and Apps that Apple does not.

The how

1. Backup your iPhone. Don’t just sync it, right click on your iPhone in the sidebar within iTunes and click Backup.
2. Download the latest version of GreenPois0n from greenpois0n.com and run it. (this is the tool that will jailbreak your iPhone
3. follow the onscreen instructions (its quite straight forward) and wait for your iPhone to reboot.
4. find an app called Loader and open it – then install Cydia.
5. your done.

 
What to do first

It depends which way you want to go, if your going for a complete overhaul with themes and icons, there are many videos on YouTube that can help. If you just want to tweak your iPhone to your personal preferences you will have to find out what you want to do and Google it. Generally its just a case of loading Cydia, searching for the package, instal it and reload.

Cracked

You will notice that for some apps and tweaks it will ask you to pay, but there are many sources that share “Cracked” versions. some popular Sources include,

iHacksRepo (http://ihacksrepo.com/)
Hackulo.us (http://cydia.hackulo.us/)
SiNfuL iPhone Repo (http://www.sinfuliphonerepo.com/)
HackStor (http://cydia.myrepospace.com/hackstor/)

Adding Sources is simple.

1. Open Cydia
2. Go to Manage, Sources
3. Tap the edit button (top right) then tap Add (top left)

Noteworthy Apps/Tweaks include,

AdBlocker — Blocks adds from safari and other apps
Apple boot logo — restores/changes the boot logo
AppSync for 4.0+ — Allows cracked apps to be installed
CyDelete — Delete Cydia apps without going into Cydia
FakeOperator — Changes the operator logo to whatever you want
FolderCloser — Closes the folder after you open an app
Graviboard — Cool gravity effect to play with icons on your homescreen
GridLock — Place icons anywhere on home screens
HD Winterboard Icon — A HD icon for the Winterboard app
Icon Renamer — ReName any app
Installous 4 — A cracked app store
Installous HD Icon Theme — A HD icon for the Installous app
LiveClock — Replaces the clock icon with on that shows the actual time
Lockdown Pro — Lock apps from unwanted users
Lockdown Pro SBSettings Toggle — An SBSettings toggle
LockInfo — Adds cool stuff to your lock screen
LockInfo Lock Weather Plugin — A lock screen weather plugin
MobileTerminal — A command line program similar to Terminal or windows’ Command Prompt
MobileVolumeSound — Sounds when adjusting volume like real Macs
My3G — Makes apps think they are on WiFi
MyWi — For tethering/making a WiFi hotspot
NoCyfresh i4 — Stops Cydia from loading packages every time it opens – saving time
NoSpot — Removes spotlight search page
NoWiggle — Removes the wiggle when moving/deleting apps
SBSettings — Settings menu
SBSettingsToggles — Buttons to toggle certain functions
Serious SBSettings HD — Theme for SBSettings
Silent Photo Chill — Removes the photo click sound
Synchronicity — Lets you use your iPhone while its syncing
Barrel — Fancy changes to the way home screens switch
Wi-Fi Sync — Enables wireless syncing with iTunes (requires app install on computer and does not allow restoring and such)
Snes4iphone — SNES emulator
Switchboard — Advanced settings for the multitasking bar
Infiniboard — Scrolling home screen
Infinifolders — Scrolling folders
Multifl0w — An expsose style multitasking switcher
MyVolume — Volume management settings
CustomBadges — Create custom badges on any app you wish
 

“‘Ultra High Definition (UHD), Ultra High Definition Video (UHDV), Ultra High Definition Television (UHDTV), Extreme Definition Video and 8K is an experimental digital video format, currently proposed by NHK of Japan, the BBC, and RAI [RTE]

The new format has a resolution of 7680 × 4320 pixels, four times as wide and four times as high (for a total of 16 times the pixel resolution) as existing HDTV, which has a maximum resolution of 1920 × 1080 pixels. According to the Yomiuri Shimbun, the Japanese Ministry of Internal Affairs and Communications will be starting a public-private partnership to develop technology for SHV in the hopes of setting an international standard for Super Hi-Vision in addition to broadcasting with it beginning in 2020.” – Wiki [http://en.wikipedia.org/wiki/Super_Hi-Vision]

With 22.2 Suround Sound -

“22.2 or Hamasaki 22.2 (named after Kimio Hamasaki, a Senior Research Engineer at NHK Science & Technical Research Laboratories in Japan) is the surround sound component of Super Hi-Vision (a new television standard with 16 times the pixel resolution of HDTV), and has been developed by NHK Science & Technical Research Laboratories. It uses 24 speakers (including two sub-woofers) arranged in three layers.” – Wiki [http://en.wikipedia.org/wiki/22.2]