I want to lock my lost iphone using mei number

1st: Your iPhone is already very securely protected and “locked” by your passcode.

2nd: FindMy is the ONLY user-accessible method to activate “Lost Mode” or to initiate a “Remote Erase.”

3rd: You have no means to initiate IMEI restrictions, although your carrier might. (Step 6)

See:

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Click here for information; in addition, post notices around where it got lost, and if applicable, contact the Lost & Found department of the facility involved.

Aside from asking your wireless carrier to blacklist it, it can't be locked through the IMEI.

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