reasons to jailbreak your iPhone:

Here are 30 excellent reasons to jailbreak your iPhone:

   1. It’s risk-free. Worst case scenario, you can restore your iPhone       to factory settings
   2. Install third-party applications with Cydia
   3. Get MMS with SwirlyMMS
   4. Add custom notification sounds and ringtones for free
   5. Use a free turn by turn GPS with xGPS
   6. Get video recording for your iPhone 2G or 3G with Cycorder
   7. Stream live videos with Qik
   8. Use Voice Over IP apps over 3G and Edge with VoIPover3G
   9. Enable Flash with iMobileCinema
  10. Download and save YouTube videos on your iPhone with MxTube
  11. Tether your iPhone with PDAnet
  12. View your iPhone on your TV with TVOut
  13. Play Game Boy, Game Boy Advance, NES and PlayStation games with       emulators
  14. Watch every single episode of South Park, American Dad, Family       Guy, the Simpsons, the Office, and Futurama for free
  15. Filter incoming calls with iBlackList
  16. Email your voicemails with Voicemail Forwarder
  17. Customize the look and feel of your iPhone with WinterBoard
  18. Quickly manage your settings preferences with BossPrefs
  19. Sort your apps into folders with Categories
  20. Run apps in the background with Backgrounder
  21. Quickly reply to SMS with iRealSMS
  22. Track your lost/stolen iPhone with iLocalis
  23. Display information such as emails, SMS, calendar and more       directly on your lock screen with IntelliScreen
  24. Spoof your caller ID with 123Spoof
  25. Change your iPhone fonts with FontSwap
  26. Get haptic feedback for your keyboard with HapticPro
  27. Show a picture of your contacts in your contact list with       Cyntact
  28. Transfer files via Bluetooh with iBluetooth
  29. Enable battery percentage on the 2G and 3G with Battery       Percentage
  30. Unlock your iPhone

Disadvantages

We get a lot of people asking us the disadvantages to jailbreaking the iPhone or iPod Touch. After all, it seems too good to be true? There is a very very slim chance that you can brick your iPhone or iPod Touch (which basically means rendering it unresponsive). But those are usually fixed by doing a reset (press and hold the home and sleep buttons at the same time). You can then reinstall firmware 2.2 and try again. Doing the research might set you back 20 minutes or so and the whole process might take another 15 minutes. If you ever take it back to Apple for warranty, you probably don’t want them to see that you’ve jailbroken it so you might spend another 10 minutes doing a firmware restore through iTunes to set your iPhone or iPod Touch back to its original settings.