A: No. That is a separate issue (Activation Lock). This article is about carrier lock. Do not confuse them.
What does exist is a half-broken, temporary signal bypass that requires you to keep the phone jailbroken, never reboot without a computer, and lose visual voicemail. unlock hub iphone 7 plus custom ipsw download
A: Your baseband did not flash correctly. Re-run the process, or downgrade to iOS 14 using a signed IPSW. never reboot without a computer
But does it work? Is it safe? And most importantly, unlock hub iphone 7 plus custom ipsw download