T Mobile Prepaid Cell Phones?

[BellaCullen347]

Ok so, I'm thinking about getting this phone-

http://www.t-mobile.com/shop/Phones/cell...on-Prepaid

but I'm not sure about the prepaid thing. The phone I have right now is from Net 10 and my previous phones were from Tracfone. So which prepaid plan is best? The $10 or the $100? And with the those plans and that phone can you get apps like Facebook, Youtube, Twitter, and games? Or does that cost more? And what do you think about that phone? And this is probably a stupid question, but how do you get apps? (I've never had a phone that could, so that's why I'm asking)