opposed to having to purchase another phone, can i trade it?

how do i know what phones i can upgrade to? because i am eligible for an upgrade, but i don't want to have to pay for a new phone...

and i dont have to pay for a data package if i don't plan on using internet, do i?

thanks!!!


btw - i want a smart phone, but not an iphone...i really like the revolution and the droid...which is better? i am in high school, love music and texting, and also do a lot of talking on the phone...

thanks!