Does it cost to get twitter on your cell phone?

[♥~MeGgI vEnGeAnCe~♥]

I want to get twitter for my cell, and most people say it depends if it costs based on the plan. I have the plan for a blackberry pearl, and I want to get twitter, but I don't want to if it costs anything.
I do have internet on my phone and Unlimited texting, but does it cost to text tweets?

[cgantz15]

You can text tweets or you can use mobile web

So you need either a Texting Plan and/or a Data Plan