IPhone unlocking and carriers?

I accidentally killed my iPhone 5c, so I got a used replacement, but it's a Verizon and my carrier is Us Cellular. If I unlock it, can it be used? Is it legal? How do I do it?

Don't think if it's legal or not, who cares. That iPhone 5C is CDMA + GSM so you can get the phone flashed to your US Cellular account. It won't help if you unlock the phone, just get the phone flashed to your account. If you need help with getting the phone flashed to your US Cellular number, mail me for more info.