Unlock phone with iTunes

Unlock how ? If you mean that you've forgotten your passcode to the phone then follow these instructions : If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

If you mean that it's locked to a carrier, contact the carrier

Unlock how ? If you mean that you've forgotten your passcode to the phone then follow these instructions : If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

If you mean that it's locked to a carrier, contact the carrier

If you mean that you've forgotten its passcode or disabled the phone follow the instructions that I've posted in two of my above replies.

how do I unlock it with itunes

If the device is disabled follow the instructions in the link in my above reply

how do i unlock my iphone 6s with itunes

Unlock how ? If you mean that you've forgotten your passcode to the phone then follow these instructions : If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

If you mean that it's locked to a carrier, contact the carrier

i wont to unlock my iphone 4

How do i unlock