MY PHONE IS BLOCKED, HOW TO UNLOCK IT?

Not to sure what your exact question is.

Blocked is one thing, locked can be a few others.

For Blocked number or message try this article

https://support.apple.com/en-us/HT201229

For a locked or passcode issue follow this article

https://support.apple.com/en-us/HT204306

If the iPhone is carrier locked you need to contact you carrier

Best of luck