I put my imei number to unlock the network lock on my phone. I think my phone gonna get hacked now?

I put it on this website, thinking it'll work unlocking the network lock. Put it in once, expecting it'll give me the unlocking code, like what the tutorial said. It's this Vodafone unlocking site. (can't post the link because the forum is marking it as a spam) Nothing happened. Second,third time. Nope. Now I just realize I might have given my imei # to a hacker website. I can't confirm it, but what can I do to prevent my phone from getting hack now?

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/ask-question/758483-i-put-my-imei-number-unlock-network-lock-my-phone-i-think-my-phone-gonna-get-hacked-now-new-post.html
via IFTTT