My iphone was stoled and before that i reset everything included my apple id, how can i block it using serial num?

Sorry to hear that. I believe there is no way you can block a phone with its serial number or else it will be too easy for anyone to block another phone. All you can do is to report the lost phone number to the local police/telecom provider to terminate that phone number. Hope that this is helpful!

Mady1425 Said:

"My iphone was stoled and before that i reset everything included my apple id, how can i block it using serial num?"

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Fond Out Here: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Modifying your Credentials:

Having been stollen, most certainly consider modifying your credentials, immediately.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option