Many of the new big LG's (the Titanium Voyager, Env Touch, Env3) are known to have problems with the operating system. They tend to freeze up if you run too many apps at once, have been browsing a while, and sometimes just randomly. My Voyager does it all the time and thats when I looked into the issue. It wasnt just the Voyager. Newer phones sometimes have the same issue. Firmware updates have not fixed the problem.
Your model is one I am not familiar with. If you havent been noticing any problems I would not worry about it. If you absolutely have to get a new LG, go for the Versa. It might seem a bit silly, but it does everything you want and no one has yet reported the problems of freezing or resetting.
http://www.phonescoop.com/search/results.php?q=versa
However, if you just wanna add that to your current plan, I suspect it will cost more than 100 bucks. In fact, without a new plan you cant get much of anything for 100 dollars. Especially not one that does more than basic calling.
I did notice at Walmart the other day they have many different pre-paid phones. One of them was the Blitz and it was on Verizon. The phone itself was 99.99.
http://www.phonescoop.com/search/results.php?q=blitz
However, its got tiny keys and looks like a kids phone, and since you are 17 I am going to guess you care more about style than function.
But I recommend you check it out. The GPS is suprisingly good and its got a nice screen.
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