can i change my iphone 4 black housing to white?

Paint it - I wouldn't recommend this.

Put a white cover on it.

Buy a white one.

carlos102 wrote:

i have iphone 4 black i want to change ir to while can i do it?

You can do anything you want. However, Apple does not sell parts. It would be up to you to source any parts you might need to accomplish this task. Be aware, you will void any warranty left on the device.