Hi ,
Both phones sim cards are different.So you will need to buy a new sim card for your Samsung Galaxy S3.Before put your new sim card,Make sure your phone is unlocked.If it's locked by particular network carrier,you will need to unlock your mobile phone.For unlocking you can approach your service provider or else try to buy an unlocking service from any one of the online unlocking service provider like Unlock-Zone.com and you can get free phone unlock instructions from MobileUnlockGuide.com I hope it will be very useful to you.