Alright lets sort out your logic
WPA psk cracking, make sure you have a dictionary file
scan in one terminal and deauth in another, which means that you will have your wireless card in monitor mode, aka you arent connected to anything which makes the last part impossible...
VNC over iphone? why?! Unless you have ethernet plugged into the computer then you cant do VNC or connect to the computer over wireless because its in monitor mode.
So i see this whole scenerio play out like this.
iphone --Wireless--> wireless router --Ethernet--> pc vnc (wireless in monitor mode)
Which just leaves us wondering what password you are trying to crack.