i reported my phone lost to my carrier does that mean my activation lock is turned off

Sprint will probably simply note the MEID as being reported stolen and ensure you are not billed for any use after the time of the report if you froze or canceled the line.

You should also file a police report.

Safeguarding your Apple account and the data on the phone is something you have to do.

Apple has some tips to help in the process.

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