Which carrier locked to?

[jaimbot]

iphone 4s: Bought it online and the seller claims it is locked to rogers(which i need). I checked the phone and couldnt find which carrier it is locked to and downloaded itools and it did not display the operator/carrier it
was locked to.
can someone please help me find out which carrier my iphone is locked to!
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[Thomasjtsi]

Go into Settings>Generl>About.... the wireless provider it's locked to will be listed.