Will I be able to upgrade my phone to Iphone?

My carrier is Verizon wireless and right now I have the Samsung intensity. I'll be honest when I say this phone SUCKS. I'm sick of it not being able to do anything, such as no internet access, terrible camera quality, no music, and did I forget to mention… NO INTERNET.

I want to upgrade to the iPhone 4s or iPhone 5 and while my upgrade eligibility is in about a month (7/23/13), my contract doesn't end until Mid- November of this year.

So I have a couple of questions.

1. Will my cellphone be able to even upgrade to an iPhone, or is it limited on certain devices it can be upgraded to?
2. Instead of paying the termination fee which Is like $280 and really expensive, could I just upgrade my phone to a new line, get the iPhone and suspend my current phone?
3.Is it possible as a last resort to buy an iPhone off eBay/amazon or something and activate it's line while suspending my current phone?

Samsung Intensity (My current phone)

http://www.newcellphonesblog.com/samsung…

I fail to understand why you are asking your questions here instead of asking Verizon.