Help Nexus 4g phones use card for wireless carrier?

[stat]

I need some help . I bought a used Nexus S 4G and there is no place for a card to put in the back so I can connect to my carrier. This phone is supposed to be unlocked but it says Sprint on the home screen. Did I get screwed?

Under the battery there are three sets of numbers a MAC, DEC, HEX but no IMEI .

 

[warbux]

Nexus S 4G is a Sprint (and therefore a) CDMA phone, which don't use SIM cards. In short, you got screwed.

 

[stat]

Thank you for the quick reply.