New Sidekick Lx problems?

I just bought a new T-mobile Sidekick lx 2009, unlocked off of Ebay. I then purchased the 50 dollar a month prepaid plan that goes with T-Mobile. Everything works great on the phone, except that i can't get onto the internet, my picture messaging won't work, and I can't have a voice-mail. I have data on my plan so I know that it isn't that, but is there anything that i can do that these other services will be available to me?