Will t-mobile charge me if i use twitter?

[nueaey]

i have t-mobile phone and i live in US.
i have unlimited texting and you know on twitter website, it says "Twitter doesn't charge anything for this, but standard text messaging rates or bundles may apply from your carrier." and i don't get this..what does it mean by it may apply from my carrier?
what does it mean by standard charges apply?

will t-mobile charge me if i send a text msg to twitter?

[Peter]

It won't cost you anything. If you have unlimited text messages, you can use Twitter's text message feature for no extra charge.

T-Mobile is your carrier.

"Standard text messaging rates or bundles" refers to what you're paying for your unlimited text messaging. If you didn't have unlimited text messaging, you'd have to pay "standard rates" but your text messaging plan is a "bundle" that will be used for all your text messaging.

Basically Twitter just sends you text messages and you can send them to Twitter. It's like having a really annoying friend. You don't have to pay extra. :-)