if it is an unlocked phone it will work with all networks. check whether your phone is locked or not. i hope you know how to check whether your phone is locked or unlocked. if you dont know follow this method. try inserting other network sim card in your phone apart from yours. if it accepts it then your phone is unlocked else its locked. you need to unlock it. you can try unlocking your phone through codes. i suggest you Unlocking4U.com to unlock your phone.