This is a very confusing topic, as the Verizon agreement is not clear. I purchased 4 phones with an unlimited plan. The promotion will pay for the phones over 36 months via bill credits. The agreement states that if the service is terminated early, there may be an early termination fee, detailed later. Of course, if you bail, you owe for the phones, which makes sense. Chatting with a rep, they said the ETF does not apply-only applies to contracts, which the "agreement" isn't. So in this case, there is no ETF, the penalty is (after 30 days- or 90 days if from Costco) you have to pay off the phone balance, plus any outstanding usage charges.
Anyone reading the "agreement" would believe there would be an ETF-there needs to be an official clarification, as I don't quite trust the reps.
So, if you cancel prior to 30 days(or 90 days if you signed up at Costco), you can return the phones and cancel the service without penalty(other than the usage, possible activation fees, and restocking(if directly from Verizon, butnot at Costco)).
In addition, the receipt mentions up to $650 ETF, but doesnt' detail it. Is this for a possible rebate to a customer for paying off another carriers payment plan, for which you need to retain service for some time period. Verizon really needs to clear this stuff up