Prepaid Mobiles

Okay, my Sidekick Slide is still under warranty, has a problem, and when I e-mailed T-Mobile, they said I could request for a “handset exchange.” The problem is, my phone was discontinued a while ago. So to sum up, I have 2 questions:
1. Will I get a completely different phone, or will I still get a Slide in return?
2. Will I be charged for having a “handset exchange”?

I have a boost prepaid phone and i wanna know if I buy an unlocked phone can I put the sim card in the new phone and still use it with boost.

I decided to buy a sidekick prepaid but I was wounering how prepaid works? I heard that you store money somewhere and a roller gets takin out everyday.

And also let’s say I put 30$ and I don’t use it for a total of 48 hours, will they take the 2 $? And where do I store the money?

I know i can’t unlock it, on a CDMA network i have to flash it but i have no idea how to do that?!
but im pretty sure it can be done since they both are on the CDMA network, any advice/help is greatly appreaciated.

I want to know how Verizon Wireless Prepaid INpulse plan work.

I want this phone that cost 250$

How much will a discount lower it to.

Don’t i still have to pay monthly because technically it is still a contract phone and thats what i paid for is a contract phone but i just put a prepaid sim card into it? I don’t see how that would get me out of the 2 year contract? Say i get it for free on a 2 year contract and then all i have to do is get a prepaid simcard and put it in and then poof! It’s a free phone i just got?

10 POINTS!
I meant prepaid t-mobile sim card