- Any Motorola V300 you find on ebay that was originaly purchased from T-Mobile will work with the pre-paid plan.
- If you buy an UNLOCKED V300 it doesn't matter were it's from because it will work on any network, any service.
- If you buy a V300 from cingulair for example, and it's not unlocked, you will need to get it unlocked, which may cost you more money. Look for unlocking kits and services on ebay, there are hundreds.
Hope this helps!