Flexing/flashing cell phones

Anyone know anything about this? I’m most interested in learning how to unlock features that Verizon Wireless (CDMA phones) blocks, such as getting ringtones off the computer and moving pics taken from ur phone to the computer, etc. I know you have to buy a cable for whatever phone you have, but than what software do you use? I have an Audiovox 8900, thinking of getting Motorola 815 (speaking of which, any1 have this phone? or a Motorola 726?)

Thanks!