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

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.

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

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

how do I unlock it with itunes

How do i unlock