Is there any way to.........
 

...........remove the carrier badging off of your phone? Kinda Odd if you are on a different carrier than what is on the phone.

Mine is etched into the casing :/

Temp solution - use touch-up paint and paint it over
Perm solution - get a new (or another) phone that matches up to the carrier you currently use

i wish there was a way to do so, i got my phone after Cingular became AT&T, but my new phone still says Cingular and it drives me crazy lol.

you could just get a new housing for it

Well, for my old T616, I got bored during chinese school and I kinda scraped it off with a pencil. LOL. I felt kinda awkward using an AT&T Blue phone on Cingular.
As for my W600, I couldn't get the Cingular logo off of it, but I ended up getting an iPhone soon after they changed the name anyway.

i got an unlocked blackberry curve for tmobile and i hate that it says at&t

Depends on what phone you have. For My w810, I had the cingular guy etched in the back battery cover, I bought a new battery cover with the walkman logo
http://cnn.cn/shop/index.php
for under $10

just buy some covers..
of course depending on your phone