Option 2 updates the PRL. Option 1 programs the MDN, MIN and Home SID into the phone, downloads the latest PRL, and sets the lock code to the last 4 digits of the MDN.
Originally Posted by RawisTheGameHhH
I just posted in a similar thread - this "issue" isn't iOS-specific, and it's not, by any means, new. See my other post for more details and a fix that's worked dozens of times (on my employee phones), every time. A carrier update fixed the "issue", even on my Moto Synergy OS (Z9/V3) phones 3-5 years ago.
If you're on a GSM provider, call your provider's customer service and ask them to push the latest carrier update to your phone (regardless of platform, and from another phone), then restart it. Yes, even ATT does pushes carrier updates when it's asked of them...