Hi guys, I will be visiting USA in July, and I have an iPhone 4 it's 2 years old, and my battery is becoming a **** and I need a replacement. I know that Apple Retail Store is able to replace this battery, with about 75 dollars, right? So I need to know if this is simple, I just need to make an appoitment on Genius Bar and they will replace in the same time? Another question, my iPhone is jailbroken, so I need to remove it? And yes, Its out of warranty."