Can I add a USB port to my stereo?

I have a 2006 Pontiac G6 with the Monsoon radio. It's got a 6 CD changer, and there's a square hole where there might have been an Aux jack, but I'm not %100 sure. Can I hook a USB port up to my Aux jack, and where can I get the part? I have a cable that plugs from my iPhone directly into my stereo, but I want one that ends in a USB port that I can plug any USB cord into.

Music app for iPhone Apple product?

I would like to download an iPhone app where I can search and listen to playlist but also save music to my own playlist… Does that exist?

Password For GamesLegion.rar File?

I have Downloaded the iPhone Unlock file from http://gameslegion.com/how-to-unlock-iphone-4-free-unlock-any-iphone-3g-3gs-4-4s-5/ and the rar file is password protected and have searched on many sites but nothing significant came out of it. Please help me in finding out the password and also suggest me the the softwares that can and unlock the iPhone for free and do also share the link

VPN on school Wi-Fi not working?

My school blocks almost everything and whenever I use VPN it says the PPTP-VPN connection couldn't be established or whatever. I think the problem is within my iphone because my friend installed VPN One Click and it worked for him. Whenever I go to websites without VPN it says intersrvers etc. Are they blocking VPN?

Can i Get sued for selling an iphone with a bad esn?

So i posted an iphone 5 for sale on Craigslist. I buy to resale, so i bought an iphone 5 of a guy he told me it had a Clean esn, but durning the transaction i put HIS sim card in the work to check if it worked. It worked great but his number is programed in the phone but i didn't think much about it. So i posted the the phone for sale and the ad said it was perfect and clean esn. So i sold it to someone on CL. And now i'm getting calls from them saying they are gonna sue me for fraud because i sold them a phone with a Bad esn. They went to take it to sprint to activate it. And they told them that the device was still under the account of the sim. Please note that the phone is NOT reported stolen. They told me they were gonna sue me and that they have an a uncle that is a detective. So i feel like i did nothing wrong and i wanna know if i can get sued for this?