Unlock Blacklisted iPhone 5?

I found this iPhone 5 two years ago and the owner never responded to my calls or emails so I soon forgot about the phone. Now I broke my own iPhone and remembered the one I had found, when I turned it on I checked the IMEI number and found it to be blocked. My question is there anyway that I can unlock it and use it?

How to change my voicemail name on iPhone 5?

When setting up my voicemail on my iPhone 5, I was asked to record my name. I thought it was asking for a greeting for when IIm not there, but it turns out it literally just meant my name. Now it sounds stupidly cringeworthy because now people hear "voicemail from hi, it's [Name]. IIm obviously not here right now so if you still need to speak to me just call back later or send me a message. Thanks!" How do I change this? I just need it to be my name alone, not all of that garble