Unlocking
Can the iPhone 6 be unlocked to use with other carriers
Can the iPhone 6 be unlocked to use with other carriers
You need to contact the carrier the device is locked to in order to see if they provide unlocking services. See this, How to unlock your iPhone for use with a different carrier - Apple Support
You need to contact the carrier the device is locked to in order to see if they provide unlocking services. See this, How to unlock your iPhone for use with a different carrier - Apple Support
Unlocking