Default [Q] [PROB] my i9500 shows up as i337 in download mode

this is driving me bunkers. so i buy an unlocked i9500 in eBay from hongkong and everywhere on the box and on the phone itself it says i9500
but in download mode it shows up as SGH-i337 and also upon using the phone (stock) it randomly asks me to sync my AT&T contacts.

the SIM card that i used is not even AT&T. and also my attempt to install CWM via odin failed.