I have read about jailbreaking but I must confess I understand very little. What are the basic advantages of jailbreaking? What is Cedia? If I attempt to jailbreak an iPhone 4 myself (after doing some proper research about how to do it) would I run high risk of turning it into a brick? Can I unlock my phone without jailbreaking it? I will travel to Europe for 3 weeks soon and would like to be able to use it with a local SIM. If I jailbreak it will I be able to use it as a personal hotspot?