All phones are not jail broken out of the box. Once you purchase, you'll have to manually Jail Break it.

First thing I did was to jailbreak the phone because correct me if I'm wrong but without jailbreak, you can't solve the basic issues like the caller id prefix.

That is just one thing of course but to me it is quite major since I went and bought such an expensive phone but I have to double entry all the people in my phone book so that I can properly identify who sms/calls me. If you can live with doing that then I suppose psyeo is right. You don't have to jailbreak until you're more familiar with the phone.