HOW TO UNLOCK A IPHONE 4 FROM SPRINT?

I really want to unlock my iphone, its disconnected and i want to connect it to another company. Can someone help me please

You can't unlock a Sprint iPhone 4.It's not a GSM phone which means it has nothing to unlock. It has no SIM slot.

I'm an iOS Technical Advisor for Apple.

The other answer on here is not accurate. Yes you can unlock a Sprint Phone. Lock can mean several things but in this case what is means is that the phone is locked onto a certain carriers network, meaning that you can't use it on another carriers network. To unlock it so you can use it on another network you have to call sprint and get ask. If you are still on contract they might charge you, if your contract is over they should give you the code with no problems. The only carrier that sells unlocked phones is T-Mobile.
Keep in mind that there are 2 different types of networks. You can't use a Sprint phone onn AT&T or T-Mobile, but you can use it on Verizon.