The Verizon iPhone is available today. That means a jailbreak hack is now available. The download is free, but it’s not something you should try unless you know what you’re doing and willing to take a risk with your new phone.
Here Greenpois0n’s Guide on How to Jailbreak Verizon iPhone 4 iOS 4.2.6 and their Greenpois0n RC5.4 download link which will Jailbreak your Verizon iPhone.
I had to unlock my iPhone to use pre-paid T-Mobile voice minutes. The video (below) shows you how to unlock a new iPhone. I didn’t unlock my old iPhone GS myself, though. My friend Roger did it in about 15 minutes. No problems. I’ve been using my prepaid voice account on T-Mobile for about a year.
The Cydia Store offers a number of applications for sale.