If i have an Iphone 4S sim card, can i use it in an Iphone 5?

If i have an Iphone 4S sim card, can i use it in an Iphone 5?

No. The iPhone 4S has a micro sim and the iPhone 5 has a nano sim. You'll have to get a new one from your carrier. But if you buy a new iPhone 5 it already comes with one.

No. Sorry. But the new iPhone features a new nano-sim card, while the iPhone 4S uses the micro-sim. You will have to buy a nano-sim at your carrier. If you purchase the iPhone 5 the package comes with the nano-sim card. Hope I helped!

Yes, you can use the SIM in iPhone 5 but you've to trim the SIM to nano SIM.