Jailbreaking is safe. However, it will "void" your warranty. i put void in quotations because if you restore the iPhone, you lose the jailbreak and no one will ever know you had a JB device... "Restoring" your warranty. I have a verizon iPhone as well. I used greenpois0n to jailbreak mine. You download the program for your computer(mac or PC) and run it. It explains how to do it... then it's done. pretty quick and painless. I've had mine jailbroken since the day it was available, and restored it once because I had to go back to the store for something. No issues. You'll be fine. However, you might want to look up what it's all about and what you can do with it before just Jb'ing the device. A jailbroken device without knowledge of what to do with it is like giving a priest a gun... it just doesn't make sense! lol