I use Tracfone and I was able to get simple instructions on how to do so using the chat feature on my account page.
I have locked my sim card. Now I have one more item on my “Clark’s must do list” (freeze your credit etc.) that I mention to family and friends.
https://clark.com/cell-phones/why-you-need-to-lock-your-phone-number-today/
I have 2 mobile services. One has a security PIN, the other has 3 security questions. I’m not sure if these qualify as SIM-Lock.
No. You need to search your provider’s web site, use the chat feature as 19and41 did or call the carrier . I have T-mobile and found the link to turn on the sim card lock by searching for “sim protection”.
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My Tech guru is Leo Laporte and he said security questions are normally not good. But he has a great way to turn them into great security. Don’t use the correct answers! Yes, you can make up non-nonsensical answers to (example) What is your mothers maiden name?
Any where I have a sign in that uses that system I make up fake answers. OF COURSE you have to write it down but it does make security very effective.
My cell carrier is Visible and I use the sim PIN lock. Piece of mind.
I just locked my sim card in Mint Mobile, very simple to do.
I have also noticed that, at least on mine, the first phone unlock after shut down is to access the SIM card, then unlock the phone.