What is your favourite Iphone application?

Iphone 3gs- application installation and jailbreaking problem?

• i brought an iphone 3gs about 3 weeks ago and installed many applications in it which were free. after some days i found out that iphone applications are stored in .ipa format so when i downloaded full version app. which are sold in itunes store for money and tried to install them in my iphone through itunes it gave an error message telling that the app. could not be installed due to an unknown error. what shoul i do to install the app. is jailbreaking a solution and if yes then please tell me what is jailbreak , what are its pros and cons , how do you do it, and any other relevant information also plz tell me that do we have to download any software in computer and the use it with the iphone connected to jailbreak it or we have to go to the jailbreaking site from the iphone.. plzz plzz plzz help me. and yes plz remember my basic ques which was how to install that app.

• Answer:

  Ok try to restore your iphone or you can jailbreak it with www.jailbreakme.com A jailbreak is that you can do whatever you want your idevice to be. And you can install installous after jailbreak to install free apps. Try seaching it in youtube , jailbreak at your own risk your iphone can maybe crash if you dont know what your doing and the warranty will go away. I dont jailbreak my because of the warranty.