I want to use my iphone to capture wifi handshakes and upload it to my kali. Is that possible?
With an iphone? No, probably not. Because as far as I know, there are no iphones that support monitor mode. I suggest using either a Nexus pwnphone from PwnieExpress, or a Nokia n900 with the pwn phone firmware. (you can install it to the nokia yourself because PwnieExpress has released the files for the community.) To find out more info on the topics, search "Nokia n900 PwnPhone" or "PwnieExpress PwnPhone".
if you wanna be a hacker get a android. They have 2x the capability of a phone even if its jailbroken.