If you port out to another service you cancel your account.

You can call Verizon *611 or 1-800-922-0204 and cancel but you will lose your cell number. If you are under contract which I am assuming you are since you mention Early Termination Fees if you receive your last invoice the ETF will be on it.

Make sure you cancel a few days BEFORE your bill closing date or you will get dinged for an extra month.

If you were on the Edge Program you would get an invoice for any money owned on your device.

Your phones belong to you if under contract and pay ETF but are useless on any other provider outside of Verizon wireless.

If you port out to another provider you would have to buy new devices in most cases.

Good Luck