So I log on to T-Mobile today and see this:
(ignore the ugly ass phone I have)

I clicked upgrade and it gave me some choices to upgrade like a 5c, 5s, or an s4/s5. These were the full-fledged price of the phones. I have no clue how upgrades work since I've never done them.
1) let's say I want to upgrade to a s4, what advantages would I get with this?
2) will I get special offers or anything with it?
I felt this didn't belong in the "smarthpone" thread, sorry if it does.