If the Sim card Not support means it may locked to network.You need to unlock it...You can get the network unlock code from the site
Onlinegsmunlock.com/samsung/rs7wp8/ for SAMSUNG GSM Network locked Phones and unlock it from Network lock.You need to specify the Model?
ALSO check whether it not support only one Sim card,if that problem means it may CDMA Network,OR may Sim card problem.If it not support other Sim card and support only one Sim means it's Under Network lock,You need to find the network,country it locked now and unlock it using the Unlock code,Only GSM Network lock Phones can be unlocked,CDMA network locked Phones cannot be Unlocked from the Mobile Phone.
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