Activation policy.

Because Apple does not have the legal right to remove the carrier lock. ONLY the carrier it is locked to can authorize that.

If the phone was advertised on eBay as unlocked, the seller lied. RETURN it. Why are you wasting your time on this?

No 3rd party has access to that information.

If you're getting an "invalid SIM" message, the phone is carrier locked. Return it and buy one you can use.

I saw what you wrote. If it works with a Verizon Sim, but using a non-Verizon Sim results in an "unsupported SIM" message, the phone is carrier locked to Verizon.

NO ONE other than Apple has access to carrier lock status of the phone based on the IMEI number.

Verizon no longer sells unlocked iPhones per the link I provided above.

In addition, you stated the device had been replaced... Where did you get that information?

If entering the serial number at Apple's warranty check site returns a message that the phone was replaced, it is STOLEN.

You got ripped off. Return the phone to the seller and go buy one that works.

No. Apple can not change the policy.

Return the phone and buy one you can use. You're wasting your time trying to find a way around this.

You said you bought it on eBay. What do you mean it was "replaced"? And what is the EXACT error message you're getting?

If you are seeing a message that the product was replaced when you attempt to check the warranty coverage on Apple's warranty verification system, that means that it was replaced by Apple as defective and it was not returned to Apple as required. In effect, it's stolen.

Return it and get your money back and go buy a phone from an authorized source.

andrey155 wrote:

but verizon not lock devices!

That is no longer true according to statements from Verizon.

Only the carrier it's locked to can authorize unlocking it.

As you have been advised already, RETURN THE PHONE and get your money back, then buy one you can actually use.

https://9to5mac.com/2018/02/12/verizon-to-lock-iphones/